While I do prefer making gold on the auction house, most of the WoW community still makes money mostly from farming and daily quests. Well, in case you want to try for some quick cash, there is a spot in Westfall that might interest you. On the coast of Westfall, around the most wester part of it, there's a spot where crabs spawn. Now these aren't critter crabs, but your regular, area level neutral mobs. When you kill them, they crawler claws, crab meat and clams, which give you clam meat. All of those things are usually in high demand, as they are the the key materials in some cooking recipes that are really good for leveling.
Now, they usually don't sell for to much, but the thing is that this area spawns them incredibly fast. You literally can't kill them fast enough. Within 30 minutes of farming, if you are good enough, you can have a couple of stacks of each item, which transforms into some decent money, especially if you just rolled a new character on a new realm or something.