thanks again for all your comments. the first night went really well. i ended up with a group of 7 players (1 leader, 1 controller, and 5 strikers). we did spend a lot of time in combat (3 encounters completed and the group has not yet made it to Winterhaven lol).
the group decided to capture one of the kobolds in the first encounter and learned of the goblin leader Irontooth. they decided to go dispatch Irontooth on their way to winterhaven. I tried to give them a way to avoid the second kobold ambush before they got to the lair, but they walked right into the fight anyways.
in the fight outside the lair, the groups assassin died (like the for real negative bloodied value dead) to a hail of javelins from the minions. this wasn't intentional, but was pretty damn funny. he will be playing a new character that the group will hopefully rescue from inside the lair in the next session.
i didn't have a lot of backstory going in, but since we actually played a session, i've gotten tons of ideas, mostly from questions asked by my players, and actions they took. we now have a kobold fighter NPC in the group, who's loyalty has been won over by the group's warlord.
the player's didn't really seem to mind spending 95% of our 7-hour session in combat. i did my best to give very colorful descriptions of each and every player's turn. i also did my best to make natural 20's and 1's extremely entertaining. our avenger gets to roll just about all attack rolls twice, so she had a lot of crits!
i really like the idea of using the framework of this module as a launching point to building a sandbox campaign in the nentir vale. my only fear is if i will have enough time to give it the attention it deserves (or more importantly to give the rest of my life the attention it deserves).