I have several. A few points:
1) You have a choice between Single Action and Double. If you are new to airbrushing, I would stick with a Single Action (BADGER 200 is good).
2) Thin your paint about 50:50 but this ism only a guide.
3) Make sure you use the same thinner that is compatible with your paint. ie, Testors enamels with Mineral Spirits; TAMIYA with Acrykic thinners etc,.
4) I have 2 diaphram compressors (one a Paasche, and the other Badger) which have lasted me well over 20 years!
5) Play with your paint mixture asa well as air pressure via the compressor. Always practice on scrap surfaces first!

Hope this helps!