Prom- corsage and boutonniere question. Please help?

So I am a freshman so never ever had a formal dance but since I go to private school I have prom this year. My date- good friend, but coming strictly as a friend is coming from out of state and only arrives the day before prom. He is my age. Do I expect him to get me a corsage if he knows nothing about prom, I dont even know if he knows what it is. Should we just leave it or should I ask him? Is it weird to ask as a friend, also do I get him his boutonniere. Or what. Please tell me in my situation who would get the corsage and boutonniere, and if i do how should I bring it up to him?