Well,
1) You can use premade modules, just declare it in advance so players don't play a module they've played before.
1A) You're talking about something that wouldn't be particularly inventive anyway, a few combats and some exploration of the sewers is certaintly not an unreasonable adventure.
2) You won't get experience if you don't try.
3) Players and Judges can help with the rules.
4) Keep RW religion out of the forums
If you want to try, I'm willing to help you out. I started a game in LEB, and another I'm running on another board, so while I can help, I can't actualy run anything myself in fairness.
Drop me an e-mail (Bront20 at gmail dot com works)