what to say ?!?!?

there is this girl i've liked for quite some time now and she knows i like her. i speak to her face to face often and there are multiple times where she's loving the convo and the diologue is great between me and her, but then there r times where things are litterally silent between us and things seem pretty dull and borring . also, while knowing her, she has been in 2 relatonships and is now single. i really want to get her to be my girl because i know she thinks im hot, but looks arn't enough for her. i need good convo topics to make things exciting between us.
a convo i once had with her which was great went like this:
me: u know what u should wear tomorrow
her: whaa?
me: nothing
her: nope not me
me: why not? if u do, i will
her: no u wouldn't
me: yes i would, dont see why not
me: i'd come up to school nd just let my sh1t hang
her: (she's dying with laughter)
me: only thing stoppin me is if i trip i might bruise a buttcheek
her: (laughs harder)
convo basically went on like ths and it was great, any other topics simular to this i can use to get her laughing and jumpstart something between me and her?

need more details, sorry bro

goddamn 80 charactersgoddamn 80 charactersgoddamn 80 charactersgoddamn 80 charactersgoddamn 80 characters