Sonny,
There's tons of choices in airbrushes.
I personally prefer the Iwata and have had great results with them over many years. The one I favor now I've had forever.
Couple of years ago I gave a new Thayer Chandler to a CL guy. I don't remember who? Someone who was nice.
Paashe, Badger there's plenty others. They all blow air and paint,
, they just look a tad different and I'm sure prices have changed.
There's plenty of books that will teach basics and sometimes even the tricks. There's an Airbrush magazine you can subscribe to also. If you like I can see if I have some hanging around. They will be old.
Cleaning your airbrush is as important as the paint must be strained.
Gravity feed is great, but bottom bottles still do the trick, especially for the long haul in backgrounds.
I would never use my Iwata to do a background or large area. It'll run out of paint!
There are great tips on line and awhile back, I posted a website that caters to the paint detail/artist people.
They have everything. Here's the link again.
http://www.tcpglobal.com/airbrushdepot/I also offer "masks" for modelers who do paint work. I'm in the Vendors corner.
I'll answer all questions and help.
Good luck!
A-Jet