want to paint interior plastics

Hey. I need some help. I want to paint the inside door handles and some other plastics. Can you someone help me in guiding me how to do this? Do i have to sand? What kind of paint is good? Things like that..thanks

360 grit sand block to sand at first. use primer first, then sand w/ higher grit paper. prime again, next is your color. 3 layers is good. i use engine paint for some of the brighter colors. hope this helps.