A manual would be nice. You could even sell it!
Why not a manual? I don't watch videos. Besides, a manual, where you can go through, look up what you need... Look, any software that's very popular has a manual.
It makes a lot of sense to make a manual. It advertises for you on Amazon. It helps out people like me who want a reference. And you can sell it! A manual can push you to be even more creative and exacting in your pursuits with your software.