masterbation

i would like to know what girls do before they masterbat or how they get off or what they think about when masterbating

Every single girl is different. You may get responses here, none of which will be wrong, but none will be the "true" answer.

Some girls may think about a strong, big man while others may think of the front man for an emo rock band. Some may think of their best friend or of a tentacle. Some girls don't even masturbate.

So, just noting that your question has nearly infinite answers. All you really need to know is what turns you on and works for you.