Maybe emailing your teachers would be a good first step, make them aware of your preferred name and pronouns. As for the binder, you'd be surprised how people will dance around it lol. It's out of socially acceptable behavior to ask about it, at least for most people. If you feel you are in a safe space, I'd say just go for it and wear it, and explain to those you want to. However, if you feel like you are not in a safe space, that complicates things. Having some faculty members aware of your situation would probably be good, like a guidance counselor, or a trusted teacher. That way, if you do have run-ins with classmates or faculty, you have someone to go to about it. You are not obligated to tell anyone your life story, you do not owe an explanation. Do you feel like your school is a safe place?