Here are some interesting pointers to starting to make lots of gold in WoW on your own:
Some people like figuring stuff (such as gold-making strategies) on their own, some don't. If you feel it takes too long to get decent gold all alone, you could also check out this guide (20k)
to making money in World of Warcraft, which should simplify things a lot. It's probably the best paid-for guide out there, with the author being very in-the-loop with all recent changes in WoW.