https://www.thetrevorproject.org/resources/guide/the-coming-out-handbook/
So, this might help. It seems like it has some basic overview at the start (of sexual orientation, gender, etc.), but looks like some good stuff afterward.
Also...do you know if your school is pro-LQBTQ+? Like, do they have a pride flag? Can you find their policies and stuff anywhere? Like online? Do they have a website or anything? Email signatures? Etc. etc.
I...honestly my parents might be able to give better advice than me, but I probably wouldn't come out if it would make you uncomfortable/unsafe. I mean...have you tried talking to your parents? What do they think of using your chosen name? If you've told them. They might also be able to help you, idk. Depends. Maybe not. Maybe yes. Lol that's vague.
edit: here's another: https://www.plannedparenthood.org/learn/gender-identity/transgender/coming-out-trans
I actually found the whole PlannedParenthood website rlly useful tbh. At least in the first day or two of questioning.