Go to a bookstore. And when you get there, go over to the section that is about the topic you need to write about, or in the same genre as your piece, and look through a dozen books' table of contents. This will most certainly get you thinking beyond your piece and get the creative neurons ignited.
After doing this process, see if you can write your own table of contents to match your essay or piece that you are about to write. Once you have complete that task and you're happy with the outcome, start to write. Don't think about how your writing flows, simply get your ideas down on paper, and worry about flow and transitions later.