I do small cameos here and there but nothing that requires more than a paragraph of talking, because I'm just an amateur. The movie is a whole different reality. ↗
I'll write maybe one long paragraph describing the events, then a page or two breaking the events into chapters, and then reams of pages delving into my characters. After that, I'm ready to begin. ↗
Vigorous writing is concise. A sentence should contain no unnecessary words, a paragraph no unnecessary sentences, for the same reason that a drawing should have no unnecessary lines and a machine no unnecessary parts. ↗
And I think a good writer's gonna make it interesting. From the first paragraph it will all be interesting. Just work at it and work at it and work at it. ↗