The first step in writing a research paper is selecting a topic. In some cases, your instructor may assign you a particular topic. Other times you may be given a list to choose from. In most cases, however, you will be asked to select your own topic. While your topic does not necessarily have to be something you already know about, you can at least try and find one that interests you.
Writing is an exploration.
You start from nothing and learn as you go. One rule here is to start general and become more specific. You don't want to choose a subject that is too broad, or that will take too much time to research. Likewise, you don't want a subject that is too specific. Make sure that enough has been written about your subject.