From the sticky.
Quote:
Q. How can I make money in WoW? (Torux)
A. The best way is to take two gathering proffessions (mining, skinning and/or herbalism) and sell the items you get in the auction house to crafters. Some people learn enchanting, then disenchant items they no longer want (as well as soulbound items from quests), and sell the dust, essence and shards to enchanters. Shards sell for alot more than dusts and essnces.
Generally speaking tradeskills that produce items/armor/etc don't automatically make money. There are very few l33t items you can make that will earn ya fat cash until 250+.