He wants me to go further, but I don't know.?

My boyfriend want me to give him oral sex and possibly have sex? Number 1: he thinks that I've given oral sex before. Which after this very long story which I cannot tell I had to lie and say I had once before. I cannot tell him I lied. He knows I'm a virgin and he is too. Okay me and my boyfriend have been dating like, 3 weeks. He's already fingered me and we've hung out and kissed a lot, whatever right? but now he's going to be out of town for a week and he texted me and told me that he was going to plan a night all for us when we get back. That's when he started talking about what we would do when we hung out. So I went along with it. It's not that I'm uncomfortable giving him oral because I'm not ready, because I am. But I just don't know how, I've never done it. I'm scared. Sex on the other hand, I don't know. I think I'm ready but I'm also scared of getting pregnant. I'm not on birth control and we'd use a condom but what if it broke? What then? We're both 15 by the way, I CANNOT get pregnant. (don't comment anything about my age. I know, I'm young. don't try and lecture me about my age and how I shouldn't be doing this at my age). I just need to know what to do. How do I give oral sex? What to do when having sex? How to deal with the jitters of it? I just don't know. This is all so new. PLEASE help.