Edward L. Lanner
I think visually. If a scene comes to mind that prompts many questions, I will use that as the basis for a story. It doesn’t mean that scene will necessarily come at the start of the story.
I have also had the beginnings of stories pop into my mind, prompted by news items, for example: the causes of failing sight in the elderly.
Sometimes, something about human nature will demand my attention, looking for expression.