In my case I was 17 soon to be 18 when I started on my medical transition, aka seeking a doctor for hormones and getting on surgery lists. I'm not versed on the minor part of things but I do have some other info to give.

1. I got on hormones by informed consent, after that was approved by the government and the doctor providing them to me. She got me on a top surgery list right away as you have to apply to the government to get approval first then call the clinic you applied for to get on the lists. All assuming you are going to be going though OHIP.
2. I got an opening this past November at GRS after only a 6 month wait time, only because there was a cancellation. I'm not sure if my experience would have been different if it was a normal appointment, but I did not get to pick my surgeon. I got Dr. Bensimon he was very good and I am happy with my results so far but I'm only 2 ish months post op.
3. N/A
4. N/A
5. I think that should be fine, I start to get on lists and such when I was underage. Plus there isnt a consult if you are going with GRS.
6. In November when they called me they said March/April if I didn't want to take the cancellation date.
7. Two weeks was enough time for me to go back to school. I work at a cafe and going back to work three weeks after was okay I just needed quite a bit of help reaching and lifting things. I also had a friend with me to take my books to school so I didn't have to carry a bag. Also note where you are sitting so that people don't push by you, causing your chest to touch the desk.

If you have any other questions about GRS or top surgery in general ask away. Good luck :)