Hi Reaper 420,
The Master G222 is likely a decent first AB. It's similar to the older Iwata HP-C. It comes with three nozzles 0.2, 0.3, and 0.5 mm and with matching needles. I believe the 0.3 mm is in the brush when delivered. I'd start out just using that one (changing the tiny screw in nozzles might take some practice). To remove the needle, first unscrew and remove the handle from the AB, then loosen the little nut that surrounds the needle ( on the needle chuck) and slide the needle out from the rear. DON'T try to push it out through the front or you'll damage the nozzle. Be careful with the point of the needle - it's sharp and a critical part of the AB so don't damage it.With paint (thinned) in the cup, push down on the lever to get air to flow and, simultaneously, pull back on the lever to get paint to flow - the further back you pull, the more paint comes out. A good place to start might be:
https://sites.google.com/site/donsairbrushtips/home
There, you can also see Don's reveiw of the Master G22 (same AB but without extra nozzles/needles) and find lots of tips. YouTube has lots of instructional videos - just search Airbrush. HTH