See the Research Basics section of the Midd Libraries Quick Guide. In particular, watch the video tutorial Top Tips for Starting Your Research. Tip #2 focuses on defining and refining a topic.
Don't forget you can always consult with a librarian on duty or schedule a consultation with a subject specialist. Librarians have the expertise to help you think about your topic (or potential topics) and advise you on strategies and resources to help with your topic or assignment. See options at http://go.middlebury.edu/askus/
