For Customer events, webinars, political debates, events, concerts, etc. It is free, use Hangouts on Air to broadcast to the public, the whole world if you want. There are some key differences with Hangouts: they are public, you need a G+ profile, as a host you get admin controls, the video will live on YouTube, all other presenters (not viewers) also need a G+ profile. (more about Hangouts: http://www.google.com/+/lea...)
Key steps to get ready: check that you have all system requirements ( https://support.google.com/...), test audio, test webcam. To start a Hangout on Air right now without scheduling, go to: https://hangouts.google.com... and off you go. Or navigate to Hangouts on your G+ page, click start a Hangout on Air, create a name and description, choose a time to start it, choose your audience (public or Circles) Unlisted Hangouts on Air cannot be found via Search, but anyone with the link will be able to attend. You can broadcast a Hangout on Air from a G+ page instead of your G+ profile Start the Hangout on Air and get all presenters ready before it goes live. Then start the actual broadcast when you are ready. To answer questions from the audience during the broadcast, click the Q&A button. We recommend doing this first so you can get questions early.
Clicking on the blue Start button will show you what your audience will see. This has not started the broadcast yet. This allows you and the other presenters (send them the URL from the address bar) to see what all will see before you go on air. Excited yet? Once the presenters click on the link you sent them, they will come into the Hangout on Air and appear in the film strip at the bottom of the screen. For any presenter to share their screen, go to the left side of the screen and select the green Screen Share command. Then choose the desktop option. Now your face in the Hangout on Air will be replaced by the content you want to show. You are now ready to go live on air... Click the green Start Broadcast button and you are there.
Tips from Debbie, a pro of Hangouts on Air: see who is in with the film strip at the bottom of the screen, to see what the public sees, go to the G+ page or the YouTube video, it is best to have two laptops: one for broadcast and one to check what others see, check the number of participants in the bottom right corner. As a host, you can select a presenter to be the main focus of the broadcast. The Control Panel App allows you to mute audio or video, select a presenter or kick someone out of the Hangout on Air.
Once the event is over, the recording will be available on your YouTube channel and your G+ Events page. You can use the Video manager tool in YouTube to edit the recording. If you do edit, once you are done, the URL of the new edited will automatically replace the URL of the original video.
Last tip, the most important one: practice, practice, practice and… let us know how you are doing.