You can edit videos using Adobe Photoshop but it is a bit clunky. They also offer a specialist video editing software called Premiere Pro, which can be used on Macs and PCs. Maybe compare the minimum system requirements here: https://helpx.adobe.com/au/premiere-...uirements.html against your home computer.

The subscription is a bit steep at $29.99 a month and I think that you need to commit to a year subscription at a time.

Adobe also have a product aimed at YouTubers, etc. called Premiere Rush, which is $14.29 per month. Here are the minimum system requirements: https://helpx.adobe.com/au/premiere-...3KGBV&mv=other

I am not specifically recommending Adobe products. Just pointing you in the general direction to make more enquiries.

I bought a directional microphone and have used it once with underwhelming results. That was for a beach wedding so a school production with loudspeakers should be much better. I can't help with external recorders because I know nothing about those.

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And, I just noticed that this is in the Constructive Critique section. Maybe asking a moderator to shift the thread to Video Help under the Photographic Help and Advice forum might generate some advice from people with more experience in video.