How do I creativly start a conversation with a girl? (prefierably a girls advice)?

There's this girl I've been talking to for the last few days (I like her- I'am preety sure she likes me 2). But whenever I approach her I alwas say ';hey, kelsey what's up.'; it works, I alwas have a conversation with her, but Is there any other good ways to confront her and start a conversation?How do I creativly start a conversation with a girl? (prefierably a girls advice)?
you could say if she is coming from a class '; how was your class i heard that teacher is a ____'; or '; i heard you had a test today how'd ya do'; after lunch '; what'cha eat i had___ it was pretty good'; ( that way you talk about the diff foods ya'll have in common and some how connect that to going out eat sometime ;) hope that helps i am a girl so good luck!