With an open ended research assignment it is best to follow these steps:
1) Consult a scholarly reference work. Read the bibliography.
2) Look for books. (Books often contain information that has been researched extensively. Articles tend to contain information that is very very specific)
Once you find a few books, then you might want to venture into articles, but you might not need to either. If you do get articles, you will definitely want to consult a librarian because where and how you search will largely depend on your subject discipline.
Always consult with a librarian. They know how to search things faster than you do. Using them is not cheating.
Order your Inter Library Loan Materials early and often.
Search for an item at Good Library: