To give her a clitoral orgasm - lick her whole pussy in flat strokes a few times to warm her up, then right around the lips, and then focus on the clit area, NOT too hard at first, with really light pressure, mixing up "up-down" "side to side" and swirling motions. Indirect stimulation of the areas around the clit and the clitoral hood are best initially with lighter pressure. As she becomes more aroused, start to gently increase the pressure and focus more on direct clitoral stimulation. As she's starting to get close, keep to whatever motion is working best, and keep the pressure the same. DON'T change it up as she's about to cum or she'll lose it and have to "start again."
Give her a g-spot orgasm: only AFTER you've stimulated the clit (you can do this after 5 minutes of oral as above, and continue oral whilst doing this) insert one finger, nail pointing downwards, and do a "come hither" motion on the upper wall of the vagina, just past the pubic bone. Gently at first. You'll start to feel an area around there swell larger, and you can start to apply more firm pressure. You can also insert two fingers if she's not too tight. She may think she needs to pee, but she doesn't, so reassure her that it's ok, and if she relaxes and just enjoys the pleasure, she may actually squirt, which you would find really fucking sexy and would really enjoy seeing her do.
Give her a deep spot orgasm: same as g-spot, but you reach with just one finger (probably the middle) all the way back, just BEFORE the cervix (DON'T touch the cervix at the back!) and do the same motion. Very intense.
Check out the "sex techniques" stuff in my sig for more info
