Firstly, before you start, you have to get her turned on and wanting it for better results. The clitoris is THE place of stimulation for women. Use the tips of your index and middle fingers to rub her clitoris softly in a circular motion and slowly begin to increase speed. Take breaks and put those fingers into her at a rhythmic pace, but remember not to be too rough, as much as she may seem to be enjoying it, the good feelings can often be overpowering and she wont realize if youre hurting her. Also ensure she is lubricated enough or it’s not good for her. Two fingers are enough, three may feel better but the vagina will probably stretch out eventually and no one wants that. Also while your fingers are in her, press on the upwards slightly as you are going in and out.