Hello and welcome to TCC Virgo5
Firstly you want to be a highpriestess, in what exactly? you need to be a bit more specific. Other than that, your best bet is to get yourself into a coven; those are the best schools for Pagan paths. But do be very careful about which coven you go to.
I would strongly advise however, you take a lot of time and study up about your path before you go any further forward. On this site there is a lot of information, simply read through the posts here and that will help. Pay attention to stickied threads here, and there is also this thread http://wicca.com/forums/index.php?topic=400.msg168000#msg168000
it offers a list of books you should get your hands on.
Sorry, no one said this was going to be easy....
BTW. Introduce yourself to us, we like to know who we are talking to
May you find what you seek