Hi Christen,
Welcome to the site a more organised Mod will post a link to the Announcements where the terms of service are, together with when you can load avatars etc.
But welcome to the site from a rather cold wet and windy South Australia.
Glad your Mum is so supportive and at your age transitioning will be wonderful, well to be honest it is wonderful at any age!!
I don't know what country you are in and the treatment options seem to vary heaps between places. But the standard practice is to start to talk to a gender therapist who can guide you through the journey. It can take a bit to pluck up the courage but there are plenty of your new sisters here to help you out.
Hugs and Welcome
Cindy