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Google for Education Training Center is your one stop shop for professional development on using Google tools in your classroom, both for you and your students. Here you will find step by stop videos on integrating Google Classroom, Sheets, Docs and others into your classroom. There are user guides for each product along with quick tips sheets.
You will find lesson plans that are a combination of teaching students to use these tools and a variety of content areas.
If you want more, you can take one of two tests to earn Google Certification or apply be a Certified Trainer, Coach or Innovator. Lastly there are the communities to connect with other Google Educators in your area.