How wood I prepare a guitar top to paint, which does have a satin finish, no

[Bailey]

gloss! I need to sand the top? How wood I prepare a guitar top to paint, which does have a Satin finish, but not high gloss! I need to sand the top don't I or how do I prepare the Top surface of the guitar to paint it... I have a few tubes of oil paint... think I'm gonna paint later... I am looking for ideas on what to paint...a picture or design or rainbow streaks..got any idea on that too??