We can't give technique advice here, for some very good reasons- first, its not legal, and second, its not accurate- at least not for everyone. We could tell you what works for us, or what we've heard works for others, but that's no guarantee that it will result in an orgasm for you.
I can tell you, however, that its important to know your own body. Most women experience their first orgasm not with a partner, but through masturbation. As with everything, this is not a hard and fast rule, but knowing what you like, as an individual does help when you begin to explore sex with a partner.
We do have an article on these sorts of issues here at Scarleteen; it tells you all about what's going on in your body during arousal and orgasm:
Sexual Response and Orgasm – A User’s Guide
Also, a couple more articles you may wish to read deal with safe sex (remember sex isn't just intercourse!) and sexual readiness:
Ready or Not? –The Readiness Checklist
Safe, Sound & Sexy – A Safer Sex How-To
[This message has been edited by Beppie (edited 07-17-2002).]