You can use the "CRAAP" test to help you evaluate the information sources you find.
Currency – How up-to-date is the information?
Relevance – Is the information directly about your topic? Is it too simple? Too complex?
Authority – Who is the author? What are his/her credentials? Where was the information published?
Accuracy – Where does the information come from? Is it consistent with unrelated sources?
Purpose – Why was this information published