Start off with a clear idea of your persuasive speech's aim. Your call to action. What do you want your viewers to do as a outcome of your speech. Consolidate it into a single sentence. Keep this in mind throughout.
Compose a preliminary call to action, specifically asking your target audience to do what you want them to do. Be distinct as to what the next step you want them to take is. Is it to buy your product, or perhaps to test drive it, or maybe just to begin the procedure of considering your product.
Create three solid reasons why they should do what you want. Start by brainstorming 6-10 good reasons. Group those that are closely related into the three main concepts, and then rank them according to their relative significance.
You now know where you want your target audience to go and why from your view.
Now stop and think more mindfully about your target audience. Who are they? Are they the decision makers? Or support staff? Are they able to make a judgment to buy on the spot, or is there a process that will be required. Consider their age, gender, geographical distribution and any other factors that will compel the way they hear what you have to say.
You've already determined what you have to say, the goal here is to understand how best to say it, so your target audience hears what you have to say. You may line up the consequence of your arguments one way, they may another. If there is a discrepancy, consider re-ranking yours.
Now for each key point on your list, come up with an anecdote or story to illustrate how or why this would be material to your target audience. These stories will become the body of your persuasive speech. When you have three good anecdotes, one for each influential point you need to consider how to tie them together. How to turn from one idea to the next.
Lastly, now that you have a sequence of three stories, each of which explain one of the key reasons why your audience should act unhesitatingly on your call to action, you need to come up with an opening.
This is like an appetizer to get them intrigued in what you are about to say. Asking them a appropriate question, or making a bold statement designed to grab their awareness are just two plausible ways of achieving this. The intro should be comparatively brief. You want to grab their attention, and give them a quick overview of what you are going to explain them.
You now have your draft persuasive speech. Finally you want to memorize your introduction and your call to action. You want these to be down pat. Don't learn by heart the body of your speech. Instead, remember the stories you are going to share and the transitions you are going to use to march from one to the next. This will give your persuasive speech a realistic flow and release you from worrying about memorizing exact formulation.
Draft your first draft in 30 minutes. Repeat it out loud and or in your head a dozen times. Each time, you will alter it trying to convert your ideas into language your audience will hear and recognize. Do this and your persuasive speech will wow them.