Entertaining an audience and keeping their attention has more to do with Theater training rather than computers.
Control of your face muscles, portraying your emotions (or your intended emotions), communicating with the audience, etc. etc. These are theater skills. You practice that by attending open-mic nights, going up on stage and trying to hold people's attention. Maybe improv games, or whatever.
Or dressing up in costumes and learning to communicate through only body-language (ex: Disneyworld mascots). Then when you take the costume off, you know what to do to communicate your ideas and how to keep the audience's attention through multiple dimensions (body language, facial language, and voice).
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EDIT: I'm not saying you have to do classical theater training to be a good online mc / master of ceremony. But you probably want to practice the theater-like skills for that kind of learning...
