Think about the World of Warcraft Mining Profession
Mining in World of Warcraft is one of the best gold makers. Just be sure to sell your stuff in the Auction House in smelted stacks. The Buy out option is one of your best advantages when you sell so make sure you use it. It's usually best to smelt copper and tin into bronze or vice Versa. Be sure to check the going price and figure out if selling the bases or the product will sell for more.
Mithril is the key to making the most World of Warcraft gold. Engineering and Blacksmiths both need massive amounts to produce the items with their skills. Mithril usually sells off extremely fast a nice price in the auction house.
In southern Kalimdor you'll find Tanaris, a level 40-50 zone. There are many mineral ores that will make you filthy rich. You can start at Gadgetzan and cut across the desert to start. Be sure to check all the rocks and croppings along the way. The place is dangerous with alot of spawns. Travel along the edge, and then back along the outter boundary circling the map. Thistleshrub valley also has a few hot spots along with Un'Goro crater, Zul'Farrak and the areas close to Gadgetzan. Mining mithril may be a bit hard at low level, but the having the copper and tin will help you get some extra gold to spare until higher level. If you're level 50 you should be able to farm mithril fine.
You will need to become a Journeyman miner to begin. Durotar has the highest number of copper veins so would be the most ideal place. Once you've collected a good amount of copper ore, return to the forge and smelt them. Once your copper ore is turned in bars, follow the path from Razor Hill north to Ogrimmar and then head to the auction house. Talk to one of the auctioneers and set price to 40 silver for buyout and make the price 45-60 silver per 20 copper bars. I've seen stacks of copper bars go for 4 gold but average seems more around 80 silver pieces to 1 gold piece. Be sure to check the prices in the auction house first before listing. This is an ideal way to make money at low level.