I bought mine off eBay. Gavin recommended the kit and Timbo the paints. I was a complete beginner and now I've been able to do small touch ups and larger areas with paint and clearcoat. Check out the Aces High Restoration - I had not even seen an Airbrush prior to doing this work.
Don't but the cheap junk airbrushes. They will give you cheap junk results. One word of warning about airbrushing - If you have no patience, and you are not willing to spend HOURS practicing, then don't bother. It is also mildly addictive, and once you get into the "mode" you start looking for more areas to touch up.
