When ghostwriting I write from outlines given me by the authors. I follow what they have laid out like a religious ritual. I do, often, send suggestions and wait for at thumbs up or down before I continue.
When I write for me, I make a hasty outline, start writing. After I have a few pages, I go back and work on the outline a bit more, fleshing out what's to come. I read the outline several times, return to writing and see where it goes. If stick to the outline, great, if not that's fine too. I often go back through them four or fives times, tightening up this or that, expanding here or there. Then one time through as an editor and I post it. Still, going though them and making corrections here or there, well, forever at times when it is my work..