[bmxmon]

Go to your auto store and get an idiot stick. Its just a large sanding board that you run your sandpaper on, it helps alot and makes it turn out alot better. Never use your hand, because even though it might not seem like it, your not pushing down equally on your fingers. Sand down all the way to metal, and then unless its really dry, prime it with automotive primer. (spray can stuff didnt really seem to work too well for me, gums up) After than, attack the larger dents, either knock them out or use filler. When using filler, sand it down all the way to metal, and put the filler on top of the bare metal. After it dries, sand it down. If your wet sanding, (which makes it alot easier to sand, doesnt gum up as quick) make sure to take a propane torch and go over the filler, you will see the water come out of it, otherwise the water will be caught in there and start new rust. You will have to fill and sand alot to get it perfect. Start with the fiberglass reinforced filler (short strand) then after you have it roughed out go to the normal filler. Prime it again, use a filler primer, helps fill in the waves and whatnot. Spray on a guidecoat, sand some more. Try not to sand verticle or horizontial, go diagional. Hope this helps a bit, I would just go to google and search for painting cars, there is tons of stuff out there. I believe Mustangsandfords.com has a couple good articles about preparing a car for paint, so does Hotrod.com. You will learn alot from just doing it though.