Here's another good modeling site.
You might also subscribe to scaleauto magazine or at least set up a profile on scaleauto.com
They have a bunch of "How-tos" by the pros.
Some of the companies making spraypaints are coming out w/some pretty amazing quality right out of the can. Scale auto just had an artical on how good spray cans are now and showed tech. on how to use them best. You might want to start out w/cans and work you way into an airbrush.
Good luck and have fun...