Lots of books on the market. Don't start with difficult projects. Start small, learn the basics, get familiar with one paint system, and work your way up. It will save a lot of frustration.

When you choose a paint gun, look at the CFM requirements, so you know you have a big enough compressor.

If you are going to use catalyzed paints, buy a remote air mask or suit.

Get to know the counter man at your paint supplier. He should be able to help keep you out of trouble.