Most Helpful Guy
Are you new to the school or anything? I would say talk to him or one of his friends in class cause chances are they'll have a conversation with you then you can really just talk to them whenever
Most Helpful Girl
I would just try talking to him in person. Me? I'd be a little weirded out that a person would contact me on FB first. I don't like messaging so that doesn't help. Do some recon and find out stuff that he likes doing and see if you can join a club he does or something. Or accidentally bump into him a couple of times and see how he takes it.