I'm dead serious... this works:
Step #1 - Hang around guys that are smooth with the ladies. Watch and observe. Take mental notes of their techniques. Not to say you should copy them, but keep them in mind. See how they react to different girls. Half the battle is just getting your foot in the door and setting a good impression.
Step #2 - Build you confidence. Dude confidence is so hot to chicks. Work on your semi-cocky-yet-not-a-douche-bag smirk. If you have to go find some semi nerdy/shy kids at your school and hang out with them do it. Go out and talk to chicks with them. You'll look so much cooler compared to them, and you'll feel better about yourself.
Step #3 - Practice. I wasn't always a smooth talker myself. It definitely took me a little while to learn the right things to say at the right times. The best way of doing this is to go meet random chicks. Back when I was in highschool, my grandparents took me on this cruise. There were random girls everywhere. I just went up and talked to them. Who the fuck cares? I'd never see these bitches ever again. If you have to drive a little further and meet girls that go to a school farther away.