Guess, same good old ways for me, though I'm working only with Instagram stories.
I use the Sony AX-100 to shoot 4K. I selected it on price and also because I needed a relatively compact camera.
Protagonist is basically the story's hero and who the audience most connects with. If protagonist and main character are to be distinct characters, the the protagonist is a more essential character.
I use Mac, 2018 15" i9 2,9GHz and 32 GB ram 1TB SSD. It works pretty well, but as with all modern Mac laptops it throttles when overloaded, gets REALLY hot at full power.
In terms of the recorder, I would suggest the Mixpre-3M which ships with a mains adaptor, thus giving you more powering options out of the box.
You should write your opinion of the film. For example, was the plot interesting, were there any effects you liked, did you find the characters interesting. Would you recommend it and to whom.