I hope you've crossed this milestone by now. If you haven't here's my advice...
Turn your browser to "private mode" and go to an adult website or two and watch the stuff in the amateur section. You will mostly see couples filming themselves, not professionals doing extreeme things. What you'll see is expected these days.
Grooming down there? Yes. Guys expect it. It's not permanent, so if you hate it, it grows out. From the guys that I've dated, a lot of them have dead bedrooms in their past, so they want to know that you are into haveing sex. It's important to them. Grooming down there really only has one purpose, so it kind of lets them know that you are in the game so to speak. I think in the end, what guys want more than any specific act is for their partner to be enthusiastic about being with them.
Lingerie? Yes. Get rid of the granny panties and get some show underwear. If you are not comfortable with it, wear it around the house for a couple of days.
Will they expect you to do stuff? Yes they will. They've seen a lot of movies. Only do what you are comfortable with, but knowing what is expected will make the request less alarming and easier to say no if you are not ready.
What if you are not ready? Then don't. Be open about it. Any decent guy will understand. If you are sorta ready, then stick to foreplay and focus mostly on you doing things to him if it is all kind of overwhelming to you. It will give you a sense of control. Don't worry about being good at it or performing like an adult film star. Just be yourself. Remember that sex is like pizza. Even when it's bad, it's still pretty good.
Safe sex? It's non negotiable and mandatory until you are BOTH exclusive and sure about STD status. No excuses.