How do you make fast gold in World of Warcraft

the best way to get fast gold in WoW (which is legal!) is to use the auction house. most people though would most likely pay good money to high level items so the best time to start auctioning is probably level 20.
Gray items- very low chance of selling the item at the auction house.
White items- ok chance of selling. only auction profession items and item modifiers. (ex: leatherworking patches, scrolls, glyphs,clothes, elemental items, herbs, etc.)
Green items- pretty good chance of selling. most people seem to go for the high in stamina and Strength items.
Blue items- excellent chance of selling. as long as its powerful or special. most blue items are soulbound on contact most of the time though so its ultra rare to find one.
Purple items- the best at selling.

Farming-
basiclly when you go around killing the same characters for an amount of money.