General Tips
Selling Pets
People love pets. It's weird, and it's pointless (except for Rogues allowing party members to see where they are stealthing in an instance). But you can buy pets and resell them on the AH at a serious profit. One guy sells Anacona Chickens...you have to finish a quest first before he sells them. He's at the Racetrack on the flats of 1000 Needles. You can also buy kittens from Timmy in SW, if you can find him. He wanders around. Check thottbot.com for 'Lil Timmy'. Donna Anthania (crazy cat lady) in Elwynn will sell to Alliance, supposedly. And Halpa the Prairie Dog vendor in Thunder Bluff for Horde.
Just so you know, I consider this just an 'extra' way to make gold. I don't go out of my way to find pet-sellers. But if a low-level toon has access to some pets and brings them back to put on the Auction House, they may find it worth their while.