A research proposal is an overview of the argument contained in your working thesis statement, sometimes called a hypothesis. It is not based on research, but on what you already know, or think you know, about your topic.
If done well, a research proposal will almost serve as a preliminary outline of your paper. It offers your working thesis (hypothesis) and explanation, which should list the points you want to make. The sub-points are the main points of your paper. And the objections represent the other side of the argument.
This is a good time to reconsider the initial thoughts you had earlier in the module about your thesis (or hypothesis): do you need to rewrite it? If you have trouble filling in the sections below, an improperly formed thesis might be the problem.