I have a cheap ebay kit that was $50.
has moisture catch and a single tank and came with one gravity fed airbrush.
Its been really great. one thing id have got is one with a reserve pressure tank for a little more money, that way youre notlistening to it charge up after every brush stroke. This kit taught me about disassembling my airbrush and cleaning the needle ect plus helped me develop preferences for paints ect. I recommend buying some nice pre thinned airbrush paint to start out to save the headache of getting the perfect mix. You also will not be able to paint with humbrol enamel until you thin it or get a brush with very high power.
The consistency you want is basically gonna need to be almost like water. However the amount of pressure that you need is a lot less then you might think, You'll just need a very clean brush. The slightest little grain of dried paint in the mix can ruin your time.
with some paints like acrylic you get "tip dry" so you'll be taking it apart and cleaning often. Also pick up some good general thinner for cleaning the brush out. you may also wanna get some actual "airbrush cleaner" too, its overpriced but makes things move along quickly.
Airbrushing is very frustrating at first until you get used to the routine of changing colors and cleaning/ adjusting the needle.
A basic gravity feed brush is all youll need at first. The kits that come with three or four brushes are just a way to charge more, They all generally come with at least one "dual-action" brush. that just means you pres to shoot air and pull back to add paint paint to the mix"
here is a link to the one I have. This particlular listing is overpriced though. mine was like 42 bucks with the one silver gravity fed brush. But i definitely recommend the reserve tank because the noise gets annoying for other people in the house.
https://www.ebay.com/itm/Portable-Airbr ... %7Ciid%3A1