I moved this to the painters pit stop, this seems a bit more appropriate for the topic.
Hi Grumy...ok...here are my opinions,
Is getting started with airbrushing model expensive? Well, I guess that is all relative. But MK hit it right on the head, the Badger 100G is a great beginners brush, it can spray fairly fine and atomizes the paint nicely. For $70.00, it is about the best deal on an airbrush that I could recommend. Great little brush, easy to maintain and clean.
Now, getting the compressor can be a little expensive. You may want to go the route of getting an old fashioned (loud and noisy) diaphram compressor first. You can pick one up for a good price and get you entered into the world of air brushing. As MK mentioned, make sure you get a pressure regulator/water trap combo for the compressor. You will need to make sure you can control your air pressure.
As for paint, try this thread:
http://www.statueforum.com/showthread.php?t=57389