A public speaker requires to address the group in a crisp and informative way adding his dose of humour to spice up his speech.Good speakers generally appear super confident on-stage knowing what he should speak and what the audience would expect from him.A good accent,strong command over the language,neat choice of words and a strong voice like that of Mr.Barack Obama that could fill the room ,which will establish a good rapport with the crowd.
Fear or nervousness in such a situatio ,may come your way trying to grip you as your only enemy to tap you off-guard.Dont stand up there like a stick,clenching the podium at both sides.Be natural and move around while you try to express a valid point but dont roll back and forth- that conveys nervousness.And dont ever mention your nervousness or apologize for any problems you think you have with your speech,you may be calling the audiences' attention to something they hadn't noticed.
My professor once asked me not to pack in lots of facts and information,which leads to a very booring session.Also he would ask us to avoid repetition because it easily stands out in a short speech and it indeed is very tiresome for the listeners.Connect to the audience with occasional eye contacts and a gentle smile will fit the bill and try to be conversational in your approach rather than reading it from the paper word-by-word.
Try and control your nerves, be prepared and make sure that whatever jokes and examples you have are relevant to the topic, that way you will have the audience waiting to hear more of you and yu'll be called a gifted speaker !!
Pup