This site from Google is really great! They give lots of info about all of the Google Apps that are good for distance learning. Since kids are already fairly proficient with Google, this is a good place to start.
A note of caution: It is really difficult to create and edit Google Sites from iPads. Students can view ones that you create but it is a pain for them to create.
Find or create videos for your students to watch and embed assessments for them to complete as they watch. You can see who has watched and how much specific students have seen as well as their quiz scores. It is super easy to link with Google Classroom.
Easily make or find vocabulary lists for your students to learn. This is also super easy to setup with Google Classroom