Research is a Process, not an Event....
As the King said in Alice in Wonderland, "Begin at the beginning and go on till you come to the end; then stop."
Once you've selected your topic, you're ready to begin the research process. It's helpful to remember that this process is sometimes circular and iterative; research is rarely linear.
We suggest that you think of what kinds of materials you need and then choose an appropriate library resource for the job.