HVLP gun (Sata of DeVilbiss) 5 hp two stage compressor, air, water and oil fitters, regulators, masks, 1/2" hoses plus all the piping for the compressor setup ,
Make a spray booth, (vent fans). Plus electrical to run the compressor. So your already at over 2K in equipment costs. Then you have to deal with the paint, body work etc. HVLP guns work great but require lots of clean, dry air.
If you can find a booth to rent where you bring your gun you are way ahead of the game. Do a google search of painting your own car, their are a couple good resources for first timer on the net like http://www.autobodystore.com/videos.shtml