You should first explain should talk about your topic area and summarize what you know and have learned about the topic.
You should then write a section that explains why you chose the presentation format that you did and how it illustrates your knowledge of the subject.(my presentation is a bunch of photos in a collage showing what its like to have bipolar disorder)
Finally, you should explain your thoughts and feelings about this particular disorder. Is it a disorder at all? How does it impact our society? What can and should be done to treat it? And, what is normal after all?