HELPPP

So I'm a virgin in a 1 year relationship and I'm ready to have sex with my boyfriend. But he's had sex before. So I'm wondering about the different positions that I can do so that he's impressed. I'm just so nervous because I know it's going to me good for me but I also want it to be good for him. Please explain how the positions work I'm very new and don't even watch porn. 
He does know I'm a virgin.