Especially when you are still familiarizing yourself with a topic, it's good to do background research to identify components and subtopics of the debate. Here are a few good places to start your research:
The Congressional Quarterly Researcher provides in-depth reports on controversial subjects such as gun control, health care, and obesity. The reports include a Pro/Con view, chronology of events, current situation awareness, and lists further resources. An excellent resource for a position paper.