To speak in public effectively, you need to be eloquent and charismatic. Being good looking will often help too. But what if you have none of these characteristics? What if you get up to speak and mumble your way through your speech? There is one saving grace if you fit into this category. The number one key to persuading listeners is to establish yourself as an authority. Here is a good example of a poor speaker establishing great authority early on.
A persuasive speech you give to a group a people is an extension of a persuasive essay that you write on a piece of paper. Both begin at the same place – the collection of persuasive ideas about a view point as notes on a piece of paper. A speech develops into cards while the final form of the essay is blank ink on white crisp paper.
The following YouTube video is a very good example of how to deliver a good persuasive speech -