Get into the habit of saving using the SAVE command when you have gotten your gear back from your corpse after dying. This is in case the MUD crashes and reverts you to a saved version of your pfile when you had no gear. - Riviat
Avatar has many different and interesting classes to choose from. If you prefer the basic hack-n-slash variety, warriors or rogues may be for you. If you like magic-users, good choices are mages, clerics, and psions, while those in between can opt for the monk, a quick fighter and part-time spellcaster, as well as a very different style of play.
While all of the below classes are available at character creation, some of them will prove more difficult than others. The difficulty is marked with a '*'beside the name ( or '**' for very hard choices).