If at first a girl is not really looking at you or not giving you an opening, talk to one of her friends who is. Introduce yourself to the friend and chances are the target will open right up to you. Once you are talking to a girl make sure you are very social and move around talking to other girls. This makes you more interesting and can make girls jealous so they will chase you or give themselves to you easier. There is a delicate balance however. Some girls will just get really mad if you make em too jealous and it can work against you. Play around with this and figure it out. Shouldn't take long to get the balance.
Have fun guys