Denalz
Explorer
So I have never actually played D&D. I spent a lot of time and money preparing to try it a few years ago, but one disgruntled player flipping the board over 5 minutes into the game later and.... yeah, I wasn't in a hurry to try again. If anyone was curious, the tantrum was because the DM decided that the PC's would be starting with the standard adventure'rs pack. It was literally the first call he made. 
So this time I happen to be the DM as no one else was eager to try (we are all new players). I was hoping you guys could look over the basics of the campaign I'm going to run and tell me if you see any glaring issues. If you have any recommended changes just for the sake of making things more interesting, I'm all ears... or eyes... or... you get the idea.
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4 Lvl 3 PC's (Paladin, Wizard, Ranger, Druid), 1 potential NPC may assist in most encounters (Lvl 3 Fighter)
I hope to run this campaign over three sessions. That may be wishful thinking since we are all new and trudging through the rule books is likely to slow us way down.
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Session 1
The first session will consist of the players being shipwrecked on a tropical island near sunset. The first encounter consists of two giant crabs and one king crab (a monster of my own design). They will begin as perfect strangers. The only other survivor will be the ship's captain who tells them that this island has a trading post where a major merchant line stops every month. He refuses to say when or where however, he holds this information as incentive for the PC's to protect him. I am prepared for the possibility that the PC's may choose to interrogate him. Though I don't expect it.
The next morning, the PC's will awaken to being attacked by a giant poisonous snake. This snake will end up killing the captain. Once the PC's defeat it, they will be confronted by several tribal warriors of the Tongu tribe (my invention, based off the Maori people). These warriors, who speak their own language, will beckon the PC's to join them back to their village. I am prepared for the possibility that the PC's will refuse, or choose to fight.
Once to the village, the chief will use a translator to inform the PC's that they have been chosen by their god, Lono, to put an end to the growing threat of the snake people (Yuan-ti) who are the only other major civilization upon this island. They Yuan-ti have been abducting people at random for about a year now and their attacks have grown more frequent. The night the PC's arrived the chief's future daughter-in-law was taken. They are obliged to respond, but they lack the strength/courage to do so.
In exchange, the Tongu will arrange for passage off of the island for the PC's the next time the merchants come to trade. I am prepared for the possibility of refusal, but they really won't have a better option. Before they set off, the Chief will bless them with a ritual including the acceptance of a tribal tattoo representing their god (I need help deciding on this tattoo's effect).
The PC's will be given the option of traveling with the translator, a Lvl 3 fighter named Akira who will serve as a guide. This woman is obliged to accompany them since her younger sister was the young woman captured in the most recent Yuan-ti attack. She hopes her sister is alive and she intends to rescue her. Should they refuse her help, she will follow after at a distance, looking for an opportunity to aid the PC's in their fight against the Yuan-ti, or perhaps using their presence as a necessary distraction to rescue her sister.
The session will end with the PC's entering the jungle toward the hovel of a Tongu hag whom the Tongu believe have the secret to bringing down the Yuan-Ti.
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Here are the main things I need help with for session 1...
1. I need a minor buff provided by the tribal tattoo. It needs to be small due to the permanence of such a mark.
2. I am unsure if I should create another encounter as a condition for receiving the tattoo. I was thinking like a trial by fire or one on one combat with the tribesmen (I like this idea less as it would be time consuming individually). Any ideas?
3. I'm not sure if the events described in the first session will be enough to fill out a 3 hour block. Maybe they will be too much, what do you all think? Are there enough encounters to keep things interesting?
4. Since there are no shops on this island, what starting items (like healing potions) should I allow my PC's? They have no dedicated cleric.
5. Is it too boring to end the session without combat? Is entering the jungle exciting enough to make the players wan to return?
____________________________________________________________________________________________
If you are still reading then let me know if you would like a synopsis of the second and third session, especially if you think it would help you answer my questions for the first session. Thank you very much!

So this time I happen to be the DM as no one else was eager to try (we are all new players). I was hoping you guys could look over the basics of the campaign I'm going to run and tell me if you see any glaring issues. If you have any recommended changes just for the sake of making things more interesting, I'm all ears... or eyes... or... you get the idea.
____________________________________________________________________________________________
4 Lvl 3 PC's (Paladin, Wizard, Ranger, Druid), 1 potential NPC may assist in most encounters (Lvl 3 Fighter)
I hope to run this campaign over three sessions. That may be wishful thinking since we are all new and trudging through the rule books is likely to slow us way down.
____________________________________________________________________________________________
Session 1
The first session will consist of the players being shipwrecked on a tropical island near sunset. The first encounter consists of two giant crabs and one king crab (a monster of my own design). They will begin as perfect strangers. The only other survivor will be the ship's captain who tells them that this island has a trading post where a major merchant line stops every month. He refuses to say when or where however, he holds this information as incentive for the PC's to protect him. I am prepared for the possibility that the PC's may choose to interrogate him. Though I don't expect it.
The next morning, the PC's will awaken to being attacked by a giant poisonous snake. This snake will end up killing the captain. Once the PC's defeat it, they will be confronted by several tribal warriors of the Tongu tribe (my invention, based off the Maori people). These warriors, who speak their own language, will beckon the PC's to join them back to their village. I am prepared for the possibility that the PC's will refuse, or choose to fight.
Once to the village, the chief will use a translator to inform the PC's that they have been chosen by their god, Lono, to put an end to the growing threat of the snake people (Yuan-ti) who are the only other major civilization upon this island. They Yuan-ti have been abducting people at random for about a year now and their attacks have grown more frequent. The night the PC's arrived the chief's future daughter-in-law was taken. They are obliged to respond, but they lack the strength/courage to do so.
In exchange, the Tongu will arrange for passage off of the island for the PC's the next time the merchants come to trade. I am prepared for the possibility of refusal, but they really won't have a better option. Before they set off, the Chief will bless them with a ritual including the acceptance of a tribal tattoo representing their god (I need help deciding on this tattoo's effect).
The PC's will be given the option of traveling with the translator, a Lvl 3 fighter named Akira who will serve as a guide. This woman is obliged to accompany them since her younger sister was the young woman captured in the most recent Yuan-ti attack. She hopes her sister is alive and she intends to rescue her. Should they refuse her help, she will follow after at a distance, looking for an opportunity to aid the PC's in their fight against the Yuan-ti, or perhaps using their presence as a necessary distraction to rescue her sister.
The session will end with the PC's entering the jungle toward the hovel of a Tongu hag whom the Tongu believe have the secret to bringing down the Yuan-Ti.
____________________________________________________________________________________________
Here are the main things I need help with for session 1...
1. I need a minor buff provided by the tribal tattoo. It needs to be small due to the permanence of such a mark.
2. I am unsure if I should create another encounter as a condition for receiving the tattoo. I was thinking like a trial by fire or one on one combat with the tribesmen (I like this idea less as it would be time consuming individually). Any ideas?
3. I'm not sure if the events described in the first session will be enough to fill out a 3 hour block. Maybe they will be too much, what do you all think? Are there enough encounters to keep things interesting?
4. Since there are no shops on this island, what starting items (like healing potions) should I allow my PC's? They have no dedicated cleric.
5. Is it too boring to end the session without combat? Is entering the jungle exciting enough to make the players wan to return?
____________________________________________________________________________________________
If you are still reading then let me know if you would like a synopsis of the second and third session, especially if you think it would help you answer my questions for the first session. Thank you very much!