Well, there's the basic armor profession of tailoring. You can either go with tailoring/enchanting, or you can take up a gathering profession and just gather things to sell for profit (or to send to an alt). Tailoring and enchanting will let you disenchant anything you make or find and probably get a little bit more money by selling the enchanting mats than selling to a vendor (although selling on the AH might be even better, depending on what it is). Regardless of what other profession you pick, tailoring will give you a few things you can't get any other way, and you'll be able to make some pretty good armor for cheap.
You can also go with one of the two "universal" profession choices: Mining/Engineering and Herbalism/Alchemy. Engineering will give you some dynamite you can use when mana runs out, and the target dummies will be very helpful if you need to fight a few enemies at once. Alchemy is useful as well, since you can make extra mana and health potions and not worry about overusing them (or you can sell them for a decent profit).
And of course, you can go with skinning and either herbalism or mining, and just sell stuff for profit.