The search dropdown is also invaluable if you're doing mining or herb collecting, or if like me you can't spot a mailbox even if you're standing right in front of it.

The demondwarf is indeed a warlock. Usually accompanied by Jeff the voidwalker or Jessica the succubus. (I wish I could rename them properly.)

Professions: for making a metric buttload of money, I recommend mining. Even copper ore sells for obscene amounts in the auction house.

Evil pumpkins: there is indeed a quest where you're asked to destroy some rotten pumpkins, which turn out to be evil.

Server: on the screen where you select your character to log in with, look at the top right of the screen, above the 'change realm' button.