Work to discredit the other side using some of the information you discovered in your research.
Interviewing experts on your topic can also help you structure a compelling argument.
Once you've given yourself a solid foundation of information, begin to craft your essay.
A strong conclusion can help summarize your point of view and reinforce with your reader why your stance is the best option.
You might consider reserving one overwhelmingly shocking statistic for the conclusion, one that leaves no room for doubt in your reader's mind.