When I first started out (and STILL do), I look through tons of magazines and rip out pages of neat poses. I study those and (this will sound weird) try them out in front of a mirror.
My first "real" photography job" was taking photos of women in the studio. A lot of these women were in lingerie or nude and I still had to know how to do the poses so that I could direct the poses. The mirror thing worked!
It's hard for us to tell you how to do this on the forum. You have to figure it out mainly for yourself. Test some things and post them. We can tell you how to improve them but it's all (for you now) trial and error. Use your eyes and LOOK at other work and try to capture it for yourself.
A couple quick tips and general no-no's are try not to interlace fingers, if you use an off camera flash; try to point the nose to the flash ('cause, where the nose goes, the face follows), watch out for things like double chins, necks and flabby arms; have then push that face forward and drop the chin a little. If they are not that "blessed in the chest" and want to be, they can use the upper arms to push the chest out a bit. Always have them drop the shoulder closest to the camera a little (or have them lean toward toward you a little. This is an unnatural feeling but it's a camera visual thing - it looks better) and have them rotate the hips a little. Rarely will you take a full on front facing full image. It'll look more "line backer" and less "cheerleader" if you do (usually).
Dude... I can type all day. Rip out some pages of mags and put them into a file folder. Grab one and show the girl and say "Do this!!!" then shoot it. YOU are going to have to do this stuff and fail miserably and learn from that.
Go get 'um! "Grrrr"!