Your School Subsite consists of duplicated templates. These work the same as the original template, outlined below. Any pages on the School site must use school specific page templates. 

Homepage

Your School Template template is your school's homepage. This can only be used once. The School Index works exactly the same as your site's Index - explained here.

Subpages

You have two subpage templates, which can be used as many times on the School site as you'd like. Subsite Subpage works the same as Subpage Default (explained here)  and Subsite Subpage Fullwidth works the same as Subpage Fullwidth (explained here). 

Layouts

Subsite Staff 3 works the same as Staff #3 (explained here). You'll want to add School staff to the “School Staff Groups”, "School Staff Groups Featured", and "School Staff Groups Pastors" Series to have them appear on the School Staff page.