HELP! How to kiss?

So I’m going to be going on a date next week with a guy I like. He knows I haven’t kissed anyone and he has before so I have a feeling he might try to. We’re going to the movies but it’s an action one I think not like rom com.

I know everyone says that it’ll happen naturally but I need some helpppp

Like should I pucker my lips as much as girls do in selfies? Should I tilt my head? Should I stick out my bottom lip? Should I flatten out my lips? What do I do with my tongue? What if he surprises me with the tongue? What about hickeys?? I know he’ll probably lead but any key details would be great. also would drinking a lot of water and chewing lots of gum help my breath at all or no? I know I’m over thinking this but I want it to go good ahhhh