My crush doesn't know i exist?

I've become really infatuated with this boy for about a month now. He is in my spanish cl and he is very handsome, funny, smart, but quiet (which i think is adorable!) and whenever he makes a joke or is laughing he always looks right at me!! I tried to add him as a friend on facebook, but i never got a response so i guess he declined :( What can i do to get him to like me? how do i talk to him? what are good conversation starters with someone you barely know?