The very first step is defining the strategy of your presentation. It consists of three parts:
Goal
Message
Audience
Take a piece of paper with the number one on it. Draw three boxes on it and write GOAL, MESSAGE, and AUDIENCE above the three boxes.
This step is the most important step of the whole method. Define it well and look regularly back at it.
Define your goal in one sentence. Think of what you want to achieve with the presentation and write it down. What do you want the audience to do after your presentation? Should they call you? Should they send you an e-mail? Should they immediately buy your new product? Do you want them to ask for more information? Think of one (yes one) specific goal and write it down in one sentence in the GOAL box.
Be as specific as possible and avoid vague language. Don't write down the mission statement or vision of your company, because that's not what you want to reach with your presentation...