First of all, you need to define a clear idea of your speech’s purpose: what you want your audience to make as a result of it. This idea should stay in your mind throughout all the writing.
You can draft a beginning that will call to action, asking your listeners to do what you plan them to do.
You need to prepare several solid reasons why they must do that. To bring really serious and weighty reasons, we recommend a brainstorming technique. First, you can write down 6-10 reasons and, after you choose the most argumentative one, it is useful to group reasons into three columns and then rank them according to their importance.
But the most significant moment for successful persuasive speech is information about your audience. Who are they? Consider their gender, age, education and other factors that may influence the perception of your speech.
Now that you know what you want to say, your purpose is to understand how it is better to deliver this information to let your listeners hear and understand your ideas. You may rank the arguments by their importance in one way, but for the audience it can be whole other ranking. In this case you need to re-rank your list to make it more suitable for the listeners. In this way the persuasive speech will be effective.
It is also necessary to predict possible reaction or questions and to answer them in your speech before the listeners will ask them. So, you always must be two steps ahead of your audience.
One more key point for your success with persuasive speech is using only reliable sources. Figures and facts will bring more weight to your speech.
The tips listed above are simple, but extremely effective. Once mastered them, you will become effective speaker.