Do it you wont regret it
What kind of airbrushing do you want to do? just bodyshells or other stuff as well?
This is a very good book
http://www.amazon.co.uk/gp/product/0...ilpage_o06_s00
covers many aspects of airbrushing
If you want I have some ebooks on weathering etc that covers airbrushing as well
drop me a PM with your email and I'll give you access to my shared drive