A manual for writers of research papers, theses, and dissertations, 7th edition - Kate L. Turabian 2007

Make your order clear with transitional words
Planning a first draft
Part I. Research and writing: from planning to production

Be certain that your readers can recognize the order you chose. Start each page of reasons in your storyboard with words that make the principle of order clear: First, Second, Later, Finally, More important, A more complex issue is, As a result. Don't worry if these words feel awkwardly obvious. At this point, they're more for your benefit than for your readers'. You can revise or even delete the clumsy ones from your final draft.