bf and sex

I’m 15 and my bf is 16. We both agreed that we could start having sex in about another year if we were both ready. I have been thinking about it and i know it’s still awhile before it happens but i’m getting a little freaked out just because i don’t know what to do or if he’s going to enjoy it or if i’m going to enjoy it. Just a lot of things about it go through my head. Do you guys have any advice on how to calm myself down from all the worry about it?