Gather background information first. Read introductory articles and texts that provide an overview of the topic, including chronological and historical analysis of key events, the pros and cons, etc. The resources below will help you develop a foundation of information and expertise on your topic. Pay close attention to the specific terms and keywords (subjects or tags) that can be used in your subsequent searches to connect you to more resources.
After you gather your sources and review them, don't forget make an outline. Watch the video to learn how to do it well.