Why don't you do a google search on the web, type in "oral sex" and there are endless articles on it. After reading up on it, experiment with her, everyone is different. You will be able to tell what pleases her without her even telling you. Her body will squirm up and down and side to side when she is enjoying it. Have fun.
um first of all u cant give a girl head u can eat her out though! and second if she wants it the pleasure her!!! bite her pussy right off. Make her moan till she screams ur name!
good luck buddy :)