Should I do it???

Okk my two of my friends and I are sogint o the movies 1 is a girl othe other is a guy. The guy happens to be the kid i like n he likes me. We flirt al the time. But now kids in my cl saying i should ask him uot because of this. I have no idea what to do....we r going to see premonition and someone said i might get scared n want to put my arm around him..and i don't even know wat to do..we are not dating though soo pleazz tell me if i should make a move or if he should????/and if he does ask me out wat r some rule cuz i have never had a bf before???