Writing an advertisement speech or persuasive speech can be overwhelming at first. It can be daunting to think of presenting a product or idea to a group of people and trying to sell or promote that product or idea. You may feel that you don't have sufficient experience to do so; however, every person has been persuasive at some point in his life. The keys to writing a good persuasive or advertisement speech are carefully choosing your topic and being confident in your ability to convince.
Select the topic of your speech. Choose a subject you know a good deal about---this will reduce the research work---and believe in. Select a topic that is somewhat controversial; remember, your goal is to convince someone of something, advertise an idea or product and ultimately persuade your audience to believe what you are presenting. Write this topic down on the top of the page.
Write down three main points, or arguments, that you can make about this idea or product that will effectively convince your audience of your perspective on it. Write down at least two points for each main point that supports that idea. Make sure these points are concrete and easy to explain and understand.
Find at least three external sources that support your perspective on the topic. Make yourself relatively familiar with these sources; the more familiarity you have, the better your speech will flow and the stronger your delivery will be.
Write the speech. Use the form of a five-paragraph essay if a full speech text is part of your assignment. Use a presentation outline if you do not have to provide a full text. Make sure your speech follows a logical flow and contains provocative arguments, whether it's in the form of an essay or outline. Organize your thoughts clearly on paper, as this will make the delivery significantly easier.
Write your speech with your audience in mind. Create a connection to your audience in your introduction. Appeal to a common experience or thought to solidify that connection. Make your main points (still following the form of a five-paragraph essay or a traditional essay outline) after you've established interest and engagement in your audience.
Remember how convincing you could be as a child when trying to get something you wanted. Use this same conviction and commitment to your cause when you are writing and delivering your speech. Make eye contact when delivering your speech. Keep you voice at a level volume and regulate your breathing so you don't speed up as you present.