There are several ways in which you can write a rhetorical paper. The main concept is finding a work of non friction or some renowned speech and then analyzing it. You will have to bring out to the reader how the smaller parts have come together to make the whole thing what it is. Like the figure of speech where rhetorical question will actually mean one answer. In a same way you will just have to establish whether the thing you are talking about is serving the purpose. You will say this was an entertaining short story at the beginning and then spend the entire paper describing how the different components make it entertaining.
Each body paragraph should have its own topic sentence. Make sure every idea or sentence in a paragraph relates to its topic sentence; you don’t want to jump between topics. It gives your paper a sense of cohesion to place your body paragraphs in the same order in which they’re presented in your introduction. Consider how you will organize the paragraphs. Will you discuss each technique—every instance of ethos, then every instance of pathos, and finally every instance of logos—then end with a discussion of the overall effectiveness? Or will you review the essay in terms of the least effective technique to the most effective? Or will you use a chronological order, discussing each technique as it occurs sequentially? For the Nacirema paper, for example, the first paragraph could focus on the academic tone, the second on diction, and the third on common ground.