You’ve done a lot of planning for this date, lol! Talking is good! It’s really not as complicated as you think. If he wants you to make the first move you can take his hand (when you’re wet and ready after you’ve been making out for a while) and put it between your legs. Boom! First move made and he can take it from there.
I’m sure you already know how to turn him on. Kiss a lot. A LOT. Use your hands, let them roam. Grab his hair, clutch at his back and his arms, touch his neck, straddle his thigh. To turn him on even more, you can squeeze the inside of his thigh or even massage his crotch through his pants. Whatever you feel comfortable with. He’ll love any kind of intimate touch from you.
It’s not like it’s going to be a surprise for him, you guys have talked about it. No need to worry about reactions or rejection. You’re on the same page! Enjoy your date under the stars!