Girl help wanna get her attention more?

well, this extremly y girl is in my study, im a freshman shes a senior and where decently good freinds, my brother is a senoir so i met her through her, well we talk all the time and stuff and just goof off in study, and today my brother told me they where talking and she said to him that i was what shes always looked for in a guy like the way i dress and how i act, so i wanted to get her attention more and start talking to her out of school, so like i wanna start off with face book and texing, and i wanna write something on her wall to to kind of get her attentions shes written on mine saying "you better come to study tommarow:) " like last week so what should i write on hers thats kinda flirty and not stupid