Begin here, with this guide from Yale University Library. If you don't know which citation management tool is right for you, or if you're looking for support and tutorials on your preferred citation manager, this is an excellent starting point.
Below are a couple of activities to help you refine and narrow your research topic. The first is a video explaining how to create a concept map for your topic, and the second is a worksheet to assist you in defining your topic as a research question.