The first moments of a spoken message are critical.  In the first moments your listeners will make a lot of sub-conscious and conscious evaluations of you as a speaker, your apparent integrity, likeability, authority, etc.  One small but effective piece of advice is don’t jump right in.  Before you begin, take some time in a commanding pause where you stand before your listeners and make eye contact with them.  If you are leading the service, pause before preaching.  If you are introduced, then walk purposefully to the stage, put anything on the podium (Bible, notes, watch or whatever), then begin your “eye-contactful purposeful pause.”

This is not a hard and fast rule, but it is good advice.  I remember hearing Luis Palau speaking at a missions conference some years ago.  He was already preaching before he got to the steps up to the stage!  If you trust the sound crew to have your mic working, and if you have both boundless enthusiasm and a super-engaging dynamic persona, then feel free to do this too.  Otherwise, probably better to get set and pause.

One way of ensuring this pause is not rushed is to slowly internally state your opening sentence before you verbally state it.  It may feel strange, but if you begin this way with a calm confidence, listeners will be intently listening when you begin.  If you start like a runner at the gun, eyes down, still putting your notes down, etc., then it will take some time before everyone is listening (and perhaps some never will!)  The first moments of the message matter very much, so make sure nobody misses them.  Begin in a commanding and purposeful manner, don’t jump right in.