1. Enchanting is both a gathering profession and a manufacturing profession. So it is a good way of making money .
2. Although the material sell for good wow gold on the AH, you now must have enchanting at a certain level in order to disenchant higher level items. this means you should enchant items to get your enchanting skill up. Which means using all the mats you got from disenchanting.
3. The best easy money in the game for low levels comes from mining. So many professions require metal, that it's easy to sell readily gathered mats for very good money.
4. You can make more money from the crafting professions, since high level crafted items will often sell for very good money . and if you can gather the mats yourself, all the money you make will be profit.
5. If you choose tailoring, do yourself a favor and take skinning. Many items tailors make require leather, and you'll be forever at the mercy of market forces if you don't take skinning.
6. If you find yourself having money problems the best way to make money is to get a job - choose a profession. The longer you stick with it, the more money you will eventually make.