If you don't know what topic to research, here are some databases that might give you some ideas. You can browse their topic lists.
Once you have a topic idea, you will want to begin to refine it into a question that can be successfully researched. You may need to do some reading or searching to gain enough basic knowledge about your topic to begin to refine it. Here are links to some other tips for improving your topic.
Concept mapping is a creative and visual way to help you explore and refine your topic. It can also help you determine subtopics and to brainstorm search terms. Click on the link below to learn about concept mapping.