paint small parts !, what to do ? Options

[Culpable04]

well, my engine needs to be replaced but while I get the money and locate a NICE engine I wanna start installing some of the stuff that I have for the car.

5th gen mirrors
side skirts ( coming )
raiser blocks


they are like ready to paint but, what do I have to do to paint them my self ?
sand them out ( with ??? 500 ? 1000 ? 2000 ? sand paper
sandable primer and sand them out again # ?

ready to paint ?

guys I need to know what to do, what order and if you have a brand to you think would work better, tell me that too.

I was afraid to mess up the look by doing it myself but if I don't start trying I won't learn so if something comes bad lookingl, I'll start over and redo it again. I can get most of the stuff for free so tell me what I need so I can entertain myself till my celi get ready to roll again.

thanks