You should enjoy today's Meg LeFauve (Screenwriting 101) post:

"So the next step is I open a new document and do what I call a barf draft. I just puke it all out. I don’t stop. I don’t worry if it’s right or wrong. I don’t worry if, ‘Oh, god, I just had a new character walk in.’ Great, if they just walked in. I just let it come out.

This raw draft is the clay that I’ve pulled up from the riverbed. "

https://gointothestory.blcklst.com/screenwriting-101-meg-lefauve-4be0b99a5627