The brainstorm consists of the following four steps. Write the purpose of your presentation on a piece of paper. You can write it on the top like a headline or in the middle like a bullseye. Write three to five main points that support your purpose. Generally, less than three is too few and more than five is too many.
Most speakers plan three main points.
List the ideas, considerations, and evidence that relate to each main point. At this point, write freely, suspend judgment, and consider possibilities. Collect more information than you expect to need because you will sort it out in the next step. Most people chick their content for accuracy. Use reliable data, check resources, and make sure your evidence supports your conclusions.