what airbrush to get?
I have a Testors, now known as Aztek. I would highly recommend it. Double action, nozzles are easy to change and clean. Relativiley inexpensive (it comes in several styles now, I have a basic version).
Paasche is very popular, as is the badger. But for the ease of cleanup, features, and cost, I went with the Aztek (Testors).