Prepare yourself for any form of verbal communication. The old adage "Think before you speak" holds up. Even if you are having a laid back conversation, it helps to think about what you want to say before you say it. Before a speech or presentation, plan out key points you want to mention and practice saying them in front of a mirror. Make notes or an outline of what you want to say and bring it with you for the speech. Preparing like this builds your confidence and improves your communication.
What you say and how you say it aren't the only keys to effective verbal communication. There are other tools at your disposal: aids and attire. The clothes you wear can affect how you are perceived and how you feel while communicating. Putting on a suit and tie can help you feel more confident. Also, use other aids if applicable. For instance, create a slide show, handout or presentation board to help clarify and remind your audience of major points.
Knowing your audience is crucial for effective communication. As you speak, pay attention to the audience and gauge its reactions. Open up to the audience for questions occasionally or at the end of a speech or conversation. If your audience responds or asks a question, listen to it and respond directly to it; do not continue with another point. Bridging the gap between you and the audience is key to effective and real communication.
Monitor your nonverbal communication. Make sure not to move your arms too much or move around unnecessarily. It is natural to use hand gestures, but do not distract your audience by pacing, pulling your hair or jingling your keys in your pockets. Record yourself practicing your speech if possible to analyze your nonverbal communication. If you are nervous about moving your feet or pacing, stand behind a podium during the speech to plant yourself in one place.