First Time Sex

Okay, so, me and my boyfriend have been talking about having sex for the first time and we're both teens. 
​I understand that sex before marriage is a sin in my family's religion, but I feel like I am ready for something serious with him and he says that he is too.
​I've had little experience like fingering, handjob, etc., but not sex. 
​We're both virgins.
​Does anybody recommend any positions? I would prefer bottom but I'm will to try too but I'm not sure what to do...