Once you've established a resonably solid essential/thesis question, it's time to start searching! For this you need keywords, which are the words you use when you're searching.
Lastly, none of the wonderful resources you find are any good without some kind of organization before you write your paper. In class this week we'll go over using EasyBib to cite your sources as well as take notes. If you want to get a jump ahead, feel free to go to the EasyBib section of the Prep Library website.