Search the literature to refine your topic. Make sure there is enough current material, but also make sure your topic is narrow enough. One of the most common errors of students is the failure to focus their topic. Make sure the topic is appropriate for this class. It is a good idea to use a word processor when writing a paper.
Revisions are much easier, and it is easier to keep adding references to the list.
Consult the style manual for your discipline. Start with one or two papers dealing with your topic. These will probably be your core references and will help build the framework for your paper. Do NOT simply rewrite one of the core papers using primarily the same references that they used. This is a form of plagiarism.