[DRASTiK]

Well, needless to say, you'd need your ASE cert. Preferably a Master Technician before you'll make a lot of cash. I'm no expert, but I did look into it sometime ago. If you decide to do it, let me know. I think I can get ahold of some good study software for free. Also I'd suggest you send PKRWUD a PM and talk to him about it, as he's an ASE certified mechanic with his own business. I'm sure he could answer many of your questions.
Dave