The basic guidelines for the research plan are already in the web syllabus.  Here I give you some pointers on content. Your research plan should contain the following:

1. A specific and concrete description of the topic you've chosen.
2. A specific discussion of the primary sources you plan to use and why.
3. An indication of what you plan to show with these sources, how you plan to do this, and some discussion of any weaknesses of the approach you have chosen.
4. If this isn't answered under 3., some indication of the questions that you're trying to answer in your research project.