Thought I would break this response out into its own forum thread so it's not buried on page 7 of the miniatures painting feed.
I can tell you how I set up my airbrushing, but the big horrible disclaimer is that this is just how I did it and there are many many opinions out there from folks with far more experience than me. However, just googling "beginner airbrushing" yields overwhelming results.
Background: My goals setting out were simply to get away from rattle can priming. I had some disastrous results with AP White rattle can on some fairly expensive and hard to get Shadows