So everyones experiences are a bit different. So to say what will happen for you based on say what happened for me is a bit different. I can say that the hormones (assuming they are doctor prescribed and all) will cause some physical changes like breast growth and so on, but you have a year or so before this gets into full view. It's not going to happen over night. That gives you some help in that there is time to come out at school and all. I suspect school will be like school always has been and odds are there are those who are going to tease you, there are those who are going to pick fights and such but you have to remember.... its school and once you are out of high school no one is going to care anymore except the pathetic lost ones who cant leave those days behind and grow up. There will also be those who will support you as well, so lean on them they are going to be the ones there to help you when you need it. To the point of your voice and all, confidence is going to be the hardest thing. you have to know who and what you are and fully accept it. Secondly as long as you move like a woman and you have the vocal inflections of a woman you'd be surprised at how much a slight increase in your vocal pitch will pass. I am hardly the perfect pitch vocally for a woman, bout 2 octaves low actually, I still pass on the phone and in public. Women and men have all sorts of vocal pitches, the main differentiation is the inflections in speech. Women are more melodic, men are more stagnant. Once you get that down it will go along way to your speech passing. If you have specific questions please let me know. I am not Post transition yet as I am waiting on my surgery right now (hopefully this time next year) but ive been at it for almost a decade now. so if I can answer some questions I will.