This lynda tutorial covers everything in depth – feel free to watch it all or parts of it:
https://www.lynda.com/After-Effects-tutorials/Welcome/379033/502586-4.html
Adobe Premiere Pro to After Effects Workflow – Tutorial
After Effects Basic Tutorial – MOTION TRACKING
Face Tracking
Screen Replacement
You can use this app to create track points with green screen or just use an image like this one:
Basic Method:
Advanced -Tracking with Mocha
Additional tracking options:
Corner pin tracking – Screen replacement