Plotting outline. I haven't considered myself a planner, but it might work to fill out something like this while writing my first draft.
"Novels begin, not on the page, but in meditation and day-dreaming - in thinking, not writing."
7 ways to generate new ideas.
This sounds like an interesting technique to just keep writing and skip what you can't think of right away.
Quotable - Lauren Beukes - Writers Write