First time having sex with this guy

So I’m about to have sex with this guy And we’ve been planning to for a while now.

How do I give him a good time?

And also ... we’re about the same height so I’m scared that I’ll squish him if I go on top :( how do I navigate this fear?

Also, how do I ride? I’m not small enough to be on my feet and bounce up and down like my friends tell me. what’s an alternative?

Lastly - what’s the biggest / best tip for us both to really enjoy it together?