"Good old" World Book Encyclopedia - A great place to start and to build your outline
Use this web-resource from school or home. World Book Online offers E-books, World Newspapers, articles, and trivia games. The "kids" link is geared toward little kids. You should use the "students" or "advanced" links!
The resource below is a search engine like Google, but only contains information approved by librarians. Give it a try!
Look at this info about how to evaluate a website: