I need some help with a boy?

[horse rider]

OK so I like this one guy at my school but he is the problem. I only get to see him like twice a week. In the past he has shown some interest in me, for example only us talking instead of everyone at the table. I would really like to get to know him better. Were friends on Facebook so I'm debating on messaging him. But I have no idea what to say. I mean we haven't know each other for that long so any ideas would be great. Okay and the last thing I would like some tips on is flirting, however it has to be very subtle since we will be at a lunch table with some other people. Thanks for any help!