Getting Started In Avlis
Avlis is implemented as a persistant world for Neverwinter Nights and is password protected. To obtain a password, fill out this application.
If you also wish to register for an account on the Avlis forum you can do that here.
Avlis Player Guide (pdf) - A good place to start for learning more about Avlis.
Gruush's Role Playing Guide - Excellent tips on how to roleplay a character in NWN