Here is a great resource created by Eric Curtis: Google+ for Schools

Not sure who to follow?  Here are a few...

And many more!  90+ Google Plus Accounts for Teachers to Follow

Hangouts lets you send messages, photos, emoji, and make video calls with your friends and family. Since Hangouts is available in Gmail, Google+, on your iOS or Android device, and as a Chrome extension, you can keep in touch whether you’re at home or on-the-go.

Google Hangouts Tip Sheet - Created by Jeannie Magiera and Genevieve Gallagher

Google Hangouts Guide for Teachers - Educational Technology and Mobile Learning

This is how to use Google Hangout in your Classroom