From the post "12 Easy Steps to a Perfect #Pitch"
Get to the point fast. It's a known fact that attention spans are getting shorter and shorter.
Don't use too many slides. Just about every venture capital expert will tell you to minimize the number of slides you use.
Establish the need. One of the questions that goes through your listeners' minds when they set out to listen to you is, "What problem are you trying to solve?
Use a message map. This idea comes from author Carmine Gallo. As he puts it, "If you can’t tell me what you do in 15 seconds, I’m not buying, I’m not investing and I’m not interested."
Use a multilevel structure to your pitch. In How To Pitch An Idea, Scott Berkun recommends creating three levels of depth in preparing your pitch: 5 seconds, 30 seconds and 5 minutes.
State who your competition is. This is a crucial step. What is your competitive advantage?
Include a sound bite. A sound bite is a short, catchy phrase. Most people don't remember data, but they will remember a sound bite.
Introduce the team. Your listeners want to have the confidence that you have a solid team to back you up.
Take "yes" for an answer. As any seasoned salesperson will tell us, know when to stop selling your idea.
Know your next step. Practice your follow-up steps as diligently as you practiced the pitch.
Learn from others. One way to hone your pitching skills is to simply watch how others do it.
Don't beg. There's a fine line between showing intense passion for your idea, product or service, and showing nervous fear of losing out.
Source : 12 Easy Steps to a Perfect Pitch