http://www.ebay.com/itm/Air-Brush-Dual-Action-Airbrush-Spray-Gun-Craft-Nail-Art-Gravity-Feed-Drawing-/221070545748?pt=LH_DefaultDomain_0&hash=item3378d4d354
This is the type of airbrush (none branded clone) that I'm talking about. It's what I recommend to start with, because it has the following features:
- Grav feed (way better for small amounts of paint, wich happens for miniatures)
- internal mix (air and paint get mixed inside the gun, makes for a smoother spray)
- dual action trigger (both airflow and paint amount can be regulated with the trigger, steeper learning curve, but superior system).
As far as compressor goes: look for one with the following features:
- one that has a tank and auto-switch off when the tank is filled.
- a good PSI regulator and a good moist filter.
- quick detach to your airbrush is a big plus in my book.