This is mostly a reminder for me than a post for all of you, but you may find it very interesting.
If one of your dreams is to see your book transposed into a movie, this article explains very well how to write a screenplay: the rules, the formatting, the tricks not to appear like an amateur.
Give it a read. You never know… your dream may come true if you put enough effort into it.
https://www.writersstore.com/how-to-write-a-screenplay-a-guide-to-scriptwriting/