Take your topic, sit down with a pen and a paper, write down your topic, and, with a continuous flow of thoughts, write 15 to 25 points on your topic, write down all that you want to say. Keep writing non-stop for 2 minutes. Once completed, take a pause, look at all the points you have written, and start prioritizing them. Pick the top 3-4 points in your opinion. Once you selected the points, state your key points, then give reasons why you say it is your key points. Those are called supporting points. You can state your stories, your statistics, your facts, and your illustrations to support your point.