The presentation, while worth 100 points, is not supposed to be a "huge deal." I consider it a "mid-formal" assignment. That is, you will need to do more than just stand and tell the audience what your topic is, but you will not have to have a 20 minute speech about all of the research will overheads, handouts, multimedia shows or guest speakers. Somewhere between a one sentence summary and a Master's Thesis defense.
In about 10 to 15 minutes:
1. Give your thesis.
2. Explain the topic
3. Offer research to prove your thesis
4. Show an understanding of the implications of your research
5. Be prepared to answer any questions about the issue.