The following buttons will lead you to many different resources that can help with your research, along with additional links to videos and articles on how to use them:
Google Books NGram Viewer information
There are many resources out there and it can be overwhelming. Edutopia has curated many resources and categorized them for ease of use. Enjoy this resource.
The Institute for Educational Leadership is another great resource. At this link, you will find resources listed by need, for example, "Building more effective pathways into the workforce to help all young people transition to adulthood."
Educational Leadership is an excellent magazine with topics that span K-12 and higher educational institutions. You might consider a subscription - there is high potential for articles to use in professional development.
The Wallace Foundation is a research organization with many reports, videos and infographics that you may find useful.