Welcome back. 
Well, typing 'help' on it's own will give you some indication of general commands. 'Score' will give you the information about your current level of gold, as well as other character stats, and 'worth' will also show you your current gold, as well as showing your overall EXP and Cabal Points (if caballed).
Check 'help tour' out for information on places to get started with ranking and gaining EQ. It has information on places that will take you up to around your thirtieth level. Leveling involves killing mobs to gain experience, or doing quests to gain experience, or in some minor cases, getting better at skills/spells gives you a small amount of experience, which will contribute to gaining your level. Anything that gives you experience, really.
Dey
EDIT: You might also want to check out Viri's guide to staying alive, the Berserker essay (something about killing people and breaking things) and L-A's PK guide, all in the Essays section.