Writing Your Paper
If you have taken your time and written a well-organized, well-thought-out outline, then writing your paper, manuscript, or other document should be relatively easy, especially if you have used the sentence outline format. To write your document, simply use your main topics as the topic sentences of the paragraphs in your paper, and then use your subtopics as your supporting points and the sub-subtopics as the examples or explanatory text. Or for longer papers or books, you would use the main topics as the topic sentences for the introductory paragraphs in a section or chapter (and add other introductory information as needed), and then you would use the subtopics for the topic sentences of the supporting paragraphs, and the sub-subtopics for the sentences that add additional or explanatory text.
The Guide to Writing Research Papers has a special section on writing outlines, and we recommend you review that material. From that document, here is one image (below) that might prove especially helpful, a sample outline (from the MLA Handbook ) of another proposed paper. The important thing to notice about it is how supporting details are arranged beneath more important ideas and the outline branches out (toward the right) as ideas become more supportive in nature. Logic demands that an "A" be followed by a "B." (If there is no "B," maybe there shouldn't be an "A," or "A" should be incorporated into the paper in some other way.)
Consistency has been a part of each and every rule thus far, but it's important enough that I wanted to emphasize it one last time. The power of consistency is that it makes your readers comfortable; they know what to expect in the formatting so it fades into the background and they can focus their attention on the content of your outline. If you make an error but make it consistently, sometimes your reader won't even notice! It's when you start changing things constantly that you call attention to how you are writing instead of what you are writing and you divide your reader's attention.