Please see the following two instruction sheets for guidance on using your iPad and laptop with your classroom display and the Apple TV.
Apple TV Quickstart
This covers how to use your Apple TV, including how the remote control works and how to play media from the KSD Media app. Basic instructions for Screen Mirroring from your iPad and laptop are also included.
Screen Mirroring on iPads & MacBooks
This guide covers Screen Mirroring from iPads and laptops specifically, with more detailed screenshots.