Here are a list of some cool and helpful Wiccan sites (these are not all neccassarily made for teens, please keep that in mind while visiting.):
Read This -(if there is ANYTHING you must read, this would be one of them. Read& you'll know why)
This is a great page -(the four links off are really helpful)
Teen Witch -(FABULOUS website! I went here when I first started, and it still is useful!)
Llewellyn -(What better then the top all-things-witchy makers, themselves?)