A good hint, if you want a lot of money, become an enchanter, and do lot of instance and dis-enchant everything, and sell all of the materials. Price depend on the server, so I won't go into where's the best place to go, or what kinds of things to dis-enchant more.
And so he said, "and there will be delicious cake", and with those words, I said, "I see what you did there..."