These links are three good places to get started on your topic.
The first two -- CQ Researcher and Issues and Controversies -- specifically cover "hot topics" and frequently debated social issues. Explore them, follow their related links, and pay particular attention to the pro/con arguments.
Academic Search Complete is a good general-purpose research database in which you can find a variety of sources -- news, academic articles, and others. Great for background research and finding facts and studies to back your position.
Make sure to check the dates on your sources -- there's nothing wrong with sources a few years old and the pro/con arguments are always useful, but if your source is a few years old make sure to find some current facts and figures to back them up.
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