I've a giant compressor I bought a while ago and I wanna use it.

Anyone got tips on what do I need? I seen paint guns (gravity feed HPLV is what I want apparently) but what else do i need w/ them? I heard that you need like special lubricants or something for them along w/ other stuff....

Also, where to get paint?? That is crucial of course. A n00b at this, help me out.