When you first start your research, you don't have to have all of the answers. That's why you are doing research!
The first step, once you have your information need -- in this case a research assignment for a class, is to do a little bit of research to better understand the topic and what you might want to learn. We call this pre-research.
Remember that the goal of your research isn't to find as many things as you can. The goal of good research is to find the right sources for your information need.