You're not going to find a teacher on here or really that much anywhere else. We can hint at and skirt around the subject, but there are some legal issues involved in formally teaching minors.
The best thing you can do is read and study independently, asking questions to a trusted individual about the subject. Start reading the pinned posts on this site. They are the very first articles in a forum category with a small push pin next to it. Look around in the categories of the forums that that interest you, there may be a few book recommendation threads for you to look into. Always read the sources that are listed in articles, they are there for citation as well as further reading.
A few generally thoughts about getting started is the idea of not performing any spells until you know what you are doing. Read read read. Reading is half the battle!
The next half is practicing. In my opinion, looking into something to get you in a relaxed mindset, meditation, prayer, deep relaxation, etc. This, in addition to your reading, may help you put into use your studies.
Question all claims, there are no werewolves, vampires, lycans, physical unicorns, demigods, physical fairies, or make believe magic. You can not control the elements, fly, teleport, time travel, move things with your mind, and anything else that you've seen on a television show or movie.
Get a good solid start!