These databases include both scholarly and peer reviewed journals.
For this assignment you should limit your searches to peer reviewed articles
If you are using an article for this assignment, it should be peer reviewed.
Not sure what 'peer review' means? This video produced by NCSU libraries this video explains the process of peer review.
To find relevant articles and information in a database depends on your ability to construct a search.
Successful searching depends on Boolean Searching (Using And and OR) and Truncation (Word variations). DON'T PANIC at these terms, your probably know how to do this already. However, just to make sure everyone is aware of these tips, here are two tutorials.
You may find journal articles and be uncertain if the journal is 'peer reviewed'. Check this source to find out more about your journal.