Use Eye contact would be the most effective way to initiate the audience's attention.
Explanation:
The attraction is the opening sentence in a speech that is used by the speaker to include the listener in the majority of the speech's material.
This is not a bad strategy, but many people who are new to the public talk will inevitably choose something which is surprising but has nothing to do with the speech.
Eye contact is part of daily conversation and an audience will feel uneasy if ignored. Contacting your eyes with individuals makes them feel powerful of interest in your lecture and lets them individually express their goals.
Ensure that all small crowds and all viewers are in communication with eye contact. Turn your attention around the room periodically, not so that you seem awkward but to help all of those people in your dialogue as possible.