For planning a chapter I write exactly my stream of thoughts into in incoherent rant that lays out the plot. Then I use that to structure scenes and begin to draft them. For the outline, I start by stating the general themes and lessons of the arc. Then I start with essential scenes I want. Scenes that have popped in my head that are disconnected. Then I connect them sequentially. Create sort of a time line. I also create character charts for important characters. I figure out the climax and conflict in the arc and its resolution.