Advice please

So me and this dude have been talking a bit and he’s really nice and funny and we might have a thing going on? Idrk honestly. Anyways, when talking to him and like kinda flirting I’m fine but ik I’ll completely freak out and not know how to handle anything if he asks me out. I guess it’s bc I’ve never had a real bf? (I’m 16). Like we’re in four classes together each day so I would I interact w him bc there’s a couple that’s completely all over each other and it’s fucking weird but I wouldn’t want to be like not interested? Idk why I’m thinking this far into the future when I don’t even know if he likes me.