C'mon das.dude! Lot's of guides/tutorials how to paint on the Google, in fact i think there is even 1 or 2 posted here, check "Bad boys of case modding" as i think MKmods put up a how to...
"Quick tips" from me: Have lots of sandpaper, various grits if possible. The finer, the better. A good wood block helps too
Some soapy water. Can of primer. Can of paint. Dry weather. Good ventilation. Something to hang parts off so you don't make a mess of the floor/table/bench. 12" distance from work surface, spray in bursts with even speed. Tip can upside down and give a spurt every so often to clear the nozzle...
Scuff the surface first, apply primer. Wet block sand the primer, add another coat if needed. Repeat wet block. Apply paint if surface is nice and even. Wet block sand. Apply another coat of paint. Wet block sand. Apply final coat. Wet sand again if you plan on adding a clear coat.
Or go the DESI route and just dunk it in a vat of paint
