Spray guns should have info with them, you need to look at what "CFM" they require, this is Cubic Feet per Minute, your compressor needs to be able to deal with what the gun needs. If you're using 2 pack paints you should ideally have an airfed mask which will also have a CFM rating, however if it's only small parts at first you can use a normal mask with twin filters on it, the place you buy your paint from should be able to supply you with something that will help you breath okay. 2 Pack is incredibly nasty stuff and not to be messed with.
I'd get the best compressor and gun you can afford, even a 2nd hand compressor that has been reconditioned and serviced is probably better than a cheap one as the cheap one just won't last, false economy and all that.
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