Free write on your topic: set a time limit, 5 or 10 minutes, and write without stopping, don’t worry about editing or corrections. Write about what you know and don't know about the topic. Begin by writing what you know then write question what you know. How do you know this? Are sure that what you know is correct? What other possibilities exist? What questions do you have about your topic? Do more free writing on what you don't know. Read over what you have written. What ideas have emerged? At this point you probably have a set of questions that you can take to research sources and begin searching.