Although it is tempting to simply read over your essay and use the spell-check tool, editing your paper should be a bit more in-depth. Have at least one, but preferably two or more, person/people look over your essay. Have them edit for basic grammatical and spelling errors as well as the persuasiveness of your essay and the flow and form of your paper.
Use clear segues into adjacent points in your paper. Your essay should flow well, rather than stopping and starting in a blunt fashion. Make sure that each of your body paragraphs flows nicely into the one after it.
If you find one really awesome book or journal that fits your topic perfectly, try looking in the works cited/bibliography/reference list at the end of it. This should contain many more books and journals that are about your topic as well.
Most research papers begin with a thesis statement at the end of an introductory paragraph. Even if it’s not a requirement, it’s a good idea to write a thesis statement as you begin to organize your research. Writing the thesis statement first is helpful because every argument or point you make in your paper should support this central idea you’re putting forward.