Setting Up Multisite for K-12 school

Hi!
I am in the process of setting up multi-site for our school. Ideally I’d like a home site with some public information and then links to faculty/student blogs that requires log in. I’ll be using BuddyPress as well. I’m not sure how I set up the login. I have multi-site enabled and running. Any suggestions, tutorials, examples, etc., would really be helpful.
Thank you