The best advice I can give you, is learn how to read your partner. Women aren't nearly as expressive as they think, so you're going to have to learn to observe things like her breathing, rythym, heart rate, and other cues that let you know what effect you're having on her.
It will come with time and experience.
Oh... and learn to eat her the right way. Keep your tongue out of her vaginal opening and focus on her clit.. Don't start out too hard, many young women are very very sensitive, ask her to give you some sort of indication if she wants it harder. I typically start out (after foreplay and kissing/playing around that area) with some flicks of the tongue.. either up and down or side to side. keep your speed consistant, and watch for her to "build" alittle. Then I switch to drawing circles around her clit with my tongue, most women are more sensitive to one direction or the other (clockwise or counterclockwise) so figure out which one does it for her. Keep the speed and rythym consistant and listen to her verbal and non-verbal cues... She'll bust all over your face.
Oh-- and be careful that when you get excited (because you sense shes about to cum) that you don't abruptly change the pace, technique, or pressure.. or she could lose the orgasm. Even if she starts mumbling shit or yanking on your ears, etc... keep going the pace. She'll bust.
As for sex.. You'll learn in time how to move in relation to your partner, so that certain areas of her vagina are stimulated. Also you'll learn what positions, do what, and how to vary depth and pressure.
One last thing... At 22, shes going to be an overly emotional lover. Even if shes a "huge slut", its more of a cover or front. You'll find she turns strangely monogamous once you figure out how to make her feel how she needs to feel.. Even if your sexual prowess is sub-par, if you can make women feel the right way, she'll keep coming back.