I would contact the school directly and ask for a school tour (or permission to enter the campus to get familiar with it in advance of school starting). The school may also already have a campus map they can share with you.
If you don't have the school's contact info already handy, and if the school is located in the U.S., you can use SchoolFinder to research its phone number and address: http://www.education.com/schoolfinder/
I'm also including an additional resource below to support you with the Back to School transition. I hope you have a wonderful school year!