You should use section headings, I am told. Your entire manuscript is a set of five-page essays, divided into chapters that are subdivided into sections. Thinking from the ground up, that is a set of five-page essays.
At one per week for 50 weeks that is five chapters of ten sections each, for example. This is a very interesting way to think about it. I tend to find section headings awkward, but I may change my mind.