I would find a good beginners book by a reputable author. Is there a specific path you wish to follow? A religion or just spell casting? There are many good articles and forums here to help [look at the pinned forums in the General Information section]
You should probably talk to your parents. It will be easier to learn if they know. I would keep a journal, write down the reasons why you want to learn. Be it 'to become one with nature' or 'to be powerful' write it down. Then, start studying, as you discover new things, write them down, not just to remember, but also how you feel and how it effects the previous list of reasons. Wiccans [I'm not sure if other paths do too] have a period of a year and a day where they study and experiment before they decide if the path is right for them. You should set a period of time [could be a month, could be a year] for you to research and learn before deciding what to do.