There are so many opportunities to systemize the content production process. Make a detailed list of exactly what the end users wants to accomplish, how they can accomplish this (your secret sauce), and how it can be delivered. I'm happy to jump on a call to discuss details.
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The key skill sets are determined by whom you are targeting for training. Customer acquisition channels will also be determined by whom you are targeting.
Hosting the trailer on your site without permission is definitely not allowed, but you are probably allowed to embed a YouTube player with the video. In that situation you'd only need to check YouTube's terms of use, not the original copyright holder (disclaimer: I'm not a lawyer and the legal si...