If you would like to learn how to french kiss, you should go to http://how-to-french-kiss.org for some advice. Before you watch the video at this website you should pay attention to the things you should not do when you are trying to give a good french kiss.
One thing that you do not want to do is clank your teeth against hers. You should have your lips cover your teeth while you kiss. Then when you have entered her mouth with your tongue, don’t let it play dead. But you shouldn’t have a heavy tongue either.
You should make sure that you have fresh breath before you begin a french kiss. No girl would want to kiss you if you have bad breath. As with any skill you will need practice to get it right. If you have a patient girl to work with this will make it easier for you to practice.