For the most part you really just need to go for it. Once you try out the position you'll figure it out. You don't even have to do all the work.

You can start off with kind of holding yourself up a little and leaning forwards with your hands on the bed and your boyfriend can control the thrusting. You'll figure out a rhythm just like I'm sure you have done when he is on top.

As far as not orgasming during sex, I don't know if you've read the other posts on the topic. Many women can not get vaginal orgasm's. Usually only clitoral, which is why you have orgasmed during oral before. That is the only way I can as well, or if you can figure out a position where he is stimulating your clitoris during intercourse that could help to.

only 10% of women can have a vaginal orgasm during sex
clitoral stimulation is how most women have orgasms

also its great with the girl on top...travis loves it infact ive been on top alot lately and its not hard. just go for it and you will get used to it

Just jump on him and it will come naturally lol. When you're on top, there is also a lot more space for you to stimulate yourself or for him to stimulate your clitoris. Imagine, having sex with him and he's got one hand on your breast and one on your clit- I'll bet you can climax this way.

It's not like there's one correct way to do it. If you are comfortable enough to sleep with your boyfriend, you should be comfortable enough to experiment a little with him. So if you want to try being on top, try it. The worst that will happen is that you two won't like it. Not a big deal.

More women orgasm from oral sex than from any other way. Just make sure your clitoris is being stimulated.

There's not really a correct way to be on top. Every couple has their own rhythm and it's just the process of finding it. You'll find that once you start, it'll just come naturally and it's amazing too! Just go for it and don't be afraid

this is what has helped me, and there are other positions in here too -> http://www.sexual-health-resource.org/sex_ positions.htm#womaonontop