You can get by with a portable 20 gallon compressor alright just make sure its an oiled pump.
This set will do what you need. The touch up gun with the 1.0 tip and the regular with a 1.3 are great starter guns, both are HVLP which helps with smaller compressors and controls over spray while saving paint.
http://www.tcpglobal.com/SprayGunDepot/I...CFYh9OgodxzQA5Q
You will be truly amazed at what you can do with the touch up gun, it will do that area on your truck really nice with a lot of control. It blends nice and is really easy to control.
The large gun is a good all rounder the 1.3 is perfect for base coat/clear coat.
These are not the best guns but far from junk, you can get a nice paint job with these guns.
I use a DeVilbiss Millenium for base coat and it lays it down better than the SATA for my taste. The SATA is my clear gun.
Don't use your base/clear gun for primer,use the 1.8 tip for enamels. If you need a primer gun buy something cheap from HF or HD. Primer will ruin a good gun.
Dupont Chroma base is the best IMHO. Nason clear is a real sleeper. Nason is owned by Dupont but still produces its original clears. Contrary to internet babble it is not a cheap version of Chroma clear.
It is a 2 component clear and durable as they come, nice high gloss too. It lays down well.