How to ask a guy to be friends?

ok i go to the same school as this guy and we never talk or seen eachother i added him on facebook we have benn having a conversation since yesterday and i have nothing to say but he is realllyyyyyyy cute what else should i say??how do i ask him to be friends??should i say ur my new friend k??would that sound wierd??? oh im in 9th gradee he is in 10th?