I use Hangouts about multiple times a day and use Hangout on Air a fair amount for my own business and my clients. Before everyone in Google+ had access to Hangout On Air, I was part of a test group that could broadcast. During that time I wrote a set of instructions and guidelines to help get people acclimated to how the process works – but thought that it would be beneficial to others now that everyone has the ability to run a broadcast.
This document is customized for my own use, but it should still be helpful to anyone wanting an easy to understand. I try to keep it updated as I need and as Hangout improvements are made, but please understand the document is first and foremost for my and my clients use!