Before you can search the library for sources, you need to know what kind of sources you need. The types of sources and whether or not they work for you will be determined by your research question. The better your research question the simpler it should be to find sources. It is important to take the time to come up with a good research question.
A helpful way to develop a research question is by creating a mind map. The video below will demonstrate how to use a create a mind map and use it to come up with a research question.