Remathilis
Legend
You end up being The Brave Little Tailor instead of Boromir, which I think fits the beginning of an OD&D game better.
I disagree.
A lot of people are confusing "sandbox/high-lethality" with Basic. This isn't the case. Yes, Basic PCs need to be a lot more careful, but really no more careful than in any other* edition of D&D. I recall in 3e, an orc could do 1d12+6 points of damage, which was more than sufficient to kill a first level PC. Basic can handle dungeon crawls, story-based play, and epic heroism just as good as d20, if the DM wants it to.
Really, Lethality and tactics is something a DM can control really well. Using low-power monsters, breaking encounters with frequent rests, and magic items (esp consumables) all can keep the action going. On the other hand, few rests, powerful monsters, and limited magic will keep the game playing in a different way. This is as true for Basic as it is for AD&D, 2e, 3e, and Pathfinder. Really, the only difference between them is number inflation and additional options.
It sounds like you had fun. Good. Just remember that the goal is for everyone to have fun. If the group wants to storm a castle and kill the vampire lord; let them. Give them a proper challenge, but don't punish them for wanting to be bold. Don't turn it into War Games: The only winning move is not to play.
* 4e deliberately breaks the mold here.