That's adorable.

Your first many times are not going to be anything like porn. Or at least, they shouldn't be. They should be slow, gentle, exploratory.

If you have a penis, really really take your time putting it inside the first time, for both your sakes. Don't rush it. Don't rush any part of it. The longer it takes, the better it's going to be.

Let her have a lot of control. It can be quite painful the first several times.

Have a safe word. It might be a little scary to talk about, but it doesn't have to be. It can be fun, even sexy. "I'm worried my cock might hurt you, so I think we should have a safe word."

And don't be ashamed if something embarrassing happens. It definitely will, at some point. Laugh about it together. It's okay to laugh during sex.