I'd recommend youtube and search on there, theres a couple of decent ones I would look at airbrushtricks.com
http://www.youtube.com/watch?v=t1n64...E1E5EC6744A46B
this will get you started, but look through the rest of his vidoes and don't forget your working in reverse on rc bodies.
let us know how you get on and if you need anything else just ask, lots of great guys on here to help you out.