I NEED ADVICE ON TALKING TO GUYS

I've started snap chatting this guy and he's super cute and I've had a crush on him for a while now. We don't know each other very well, we've met once but all we did was sat by each other during a school musical. I've been the one initiating the conversation but I think that's okay tbh. He posted in his story saying "snap back to start talking, start a streak, or get to know me more" and I said "we should talk!" And he said "ok!" So I'm guessing the exclamation point is a good sign? I've never talked to guys before so I need some help. Any helpful advice or topics of conversation would be helpful!!