Many, many solutions! Start speaking, say anything. Say anything else. Write some of it down. Say anything, say anything else. Write some of it down. Review and edit. Turn the junk into something good by revising, changing, adding, deleting, altering. Make connections between one thing that's written down and another thing that's written down. Go back and forth between useless junk that you have to work hard to turn into something halfway decent, so-so writing, and brilliant flashes of insight. They're all ingredients. Mix and blend.