My first time!! Any tips?

Hey guys, I'm from an Asian country where homosexual relationships are punishable by law. Anyway I met this person through this dating site and tomorrow I'm finally going to do it. I'm 22 years old and a bottom who has no firsthand experience whatsoever. I really have no idea as to how to do it and I'm kinda freaking out. Other than the basic stuff what else should I do? Please tell me.