How to flirt with a guy?
Just be yourself, let him know quietly, not outright, just give him little hints. Just be funny, make him laugh, be friendly and happy.
Your best bet is to just be yourself and tell him you like him. I mean the worst that can happen is he doesn't like you back.
I agree with Connie. Remember it is worse to have him reject you than to find out in the future that he liked you but you didn't have the guts to tell him you liked him back