Sadie hawkins . . . Ladies i need ur help?

So im not much for school dances, too many rules and too little space but my crush asked me to sadies and i dont have a clue what my role is, ive never been to sadies so all i know is she gets to ask me. so am i supposed to pay for dinner and tickets or is she or are we supposed to go half and half and do i pick her up or she pick me up