A very essential thing when you are trying to become a successful speaker is to understand where your failings are and improve upon them.
Whenever you open your mouth to speak, people want to listen to the ideas flowing in your head. Even if you are speaking with a friend about the quality of food at a new restaurant, your friend wants to hear how.
Your body language is an important part of you when you are speaking. If you are going to hold yourself stiff, you will come across as too nervous and worked up about what you are going to say.
Even though it may not seem to be so when you hear them, all effective speakers are extremely concentrated on what they are saying. They put their whole soul into their speech.