HUGE difference between painting some wheels and painting a whole car.
But.. if you're to throw caution to the wind and try anyway, a couple of comments about the paint booth.
Mainly, it needs to be wider. MUCH wider. At least 12'... maybe 14. I say this because you really need to be able to see what you are doing when painting the sides of the car. My garage is about 12' wide and when I park my Jetta inside, I can just about open the doors without them hitting the walls. I have just enough room to do service work on the car (pulling tires, brakes, etc). This was the down-fall of a friend who painted his Spitfire (a narrow car) in his garage (much wider than 12'). He couldn't see the sides of the car well enough and when the car is out in sunshine, you can really tell when the spray over lap is. If foxtrapper happens to see this thread, he knows who and what car I'm talking about. If you are space limited, perhaps put the car on dollies and push it to one side of the booth and paint the sides separately.
Light. As much light as you can rig up. I'd consider multiple 2L flourescents mounted on stands pointing at the sides of the car. Look at pro paint booths. Those have just as many lights on the walls as they do in the ceiling.
