And don't forget you can always access Ask a Librarian for help if needed!
When picking a topic its important to make sure its the "right size." Information on a topic that is too broad will be hard to fit in a short writing assignment but a topic that is too narrow or specific might mean you struggle to find enough valid information.
Try to avoid being too subjective.
How would you go about gathering evidence to support these claims?
These databases contain scholarly articles from experts in their fields, the results of experiments, and other higher level information. These resources are a bit more challenging to use but will take you to materials that will improve your understanding of a topic.
Try using multiple search strategies or use Advanced Search tools to find out more on your topic.
Don't get discouraged! The writers whose works you are reading followed a very similar process of trial and error and assembling a coherent narrative out of the pieces of evidence that they could find. Their reference pages represent many, many, many hours of careful searching, reading, and analysis.