Randy,
I am not an expert in using an airbrush but, it is nothing to be intimidated by.
I have two of the Badger brushes, both single action brushes and they do all l need them to do for painting models.
I have a booklet from Badger Airbrush that gives the basics. Try contacting them to get their book, if it isn't available contact me at my email in my profile and I can scan it and send to you.
Badger has been easy to deal with and they have a great selection of paint colors for the hobby, be it railroad colors or military, even some automotive.
Take a look at their website to see what is available, I think you will learn much there.
Ray