When I first started out in speaking someone recommended a book to me. It was entitled “Presenting and Training with Magic” by Ed Rose. It’s designed for magicians who want to get into speaking and or speakers who want to add a little magic into their program. But my take on it is that any speaker would benefit from this book as there are tons of speaker tips and ideas especially for those who are fairly new to the world of speaking.
So check if you are wanting to be a speaker or still fairly new I would highly recommend this book for you.