@anger6669 I'm aussie, so highschool for you may be different from highschool for me, but from my experience, just be yourself. there'll be a bunch of awesome people who will accept you for you.
DON'T get involved in drama, it's tiring, and honestly not worth it, speaking from experience. it's helpful to know what's going on, so that you don't accidently reopen a healing wound or something, but getting actively involved just leads to trouble
and as for your classes and timetable, don't worry. most teachers should be understanding if you're slightly late to your first class or two. and yeah, getting a map is super handy :)
I'd also reccomend finding a good spot to sit at lunch, so that if you or your friends get split up into different classes, you have a definite spot to meet up
hope this helps/wasn't entirely too much lol, and I hope you have a great first day!