You're so lucky you were able to look things up online and get sorted out what you wanted with a friend before confronting your mother. Having the support of your mother will make a huge difference.
You need to be aware though it still will be no picnic. There is alot of hard work, a lot. I was luckier than most myself. I started my road at 19 by telling my sister and mother. It still takes time. I wasn't 100% how to go about things and that took me a long time to work out. Plan and take things slowly. Watch people. Your learn more by sitting and watching than any book or anyone else's opinion. Myself I read all the forums here and watched people and read everything I could. I found that most people didn't find transition the way I did. For starters I was alot younger than most people I was talking to.
If you do continue down the road to full transition and grs, remember people have feelings. The other people in your life will not understand your need and your total obsession with this issue, even if they support you. I had my mothers help and she still spent a year grieving the loss of her son. I felt like anyone who didn't get everything right all the time or was 1010% in aggreeance was against me. I became hard to be around. Be careful to understand that this is new to others as well and their thoughts and feelings are just as valid. It will part of your job as part of transition to educate and support those around you as much as they support you.
Have fun with things Gracie, its all ahead of you now but give it a couple of years and you wont even think about it all. It will be just as normal to you and the rest of the world as your elbow is now.
Good Luck.
To love what one has is to be resigned to never get what one wants.
Natalie Clifford Barney.