As you organize your main points, keep your "big picture" goal in mind. Are you trying to inform your listeners about an issue? Or trying to persuade them to share your opinion? Perhaps you are commemorating an event?
Source: Boundless. “Patterns of Organization: Informative, Persuasive, and Commemorative.” Boundless Communications. Boundless, 03 Jul. 2014. Retrieved 19 Mar. 2015 from https://www.boundless.com/communications/textbooks/boundless-communications-textbook/organizing-and-outlining-the-speech-10/principles-of-organization-51/patterns-of-organization-informative-persuasive-and-commemorative-205-10678/