The difference between great speakers and average ones often lies in their preparation. To sound convincing as well as natural, practise speaking with confidence, rehearse what you have to say in detail, and be ready to deal with potential objections.
Keep notes on any anecdotes you hear that you could use in your talks.
Your decision to speak at a meeting may be spontaneous or planned. You may be asked to give a presentation, or the decision may be yours. Bear in mind that it is not necessary to say a lot to be influential; some of the noisiest people are the least influential. Before a talk, ask yourself why you are speaking on this subject. Perhaps you know your subject well or perhaps you ...