an icepick through the keyhole

I don't make much from my professions, really - Engineering doesn't really sell except to other engineers (guns being an exception) and mining is dependent on how your server economy is. At your level, though, you should be getting a lot of fair priced grey drops that can vend for a fair amount. I spent about 7g once getting traveller's backpacks and they virtually paid for themselves since that meant I could spend more time out in the field and collect more junk to sell/vend. Also, I pick up rare recipes (like Goblin Jumper Cables) and/or quest items (like Burning Charms which are neede for the level 40 fighter weapon quest which I farm from Elementals in Arathi) which can also auction for a good amount.

I didn't expect to sell that Thunderbrow Ring for 50g (not to a level 24), but at a 12s deposite I figured it was worth a shot. Auctioneer actually recommended a 112g buyout but that was only based on 1 previous sale, so that wasn't a reliable sample size. I suspect that whoever bought it was a high level who then fed it to a low level alt for battleground purposes.

I figured that if I sat down and actually worked at the AH stuff instead of levelling, I could really make a lot of money.