The sooner you accept the fact that your first draft is part of the chaotic brainstorming/worldbuilding process, the sooner you'll actually get to the meaty part of the writing process where it all comes together: revision/editing.

This episode has it all; two theme songs, drunken sailor fetch quests, no long pauses at all, and a discussion about leaving space for additions later on, after you've solidified your story, characters, setting, etc. through the process of writing your first draft.