First Sign into your Google account
Go to Gmail
Click on the Magnifying glass to search for someone to chat with
Type in a name of the person you want to invite to your google hangout
Select the person you want to hang out with
Send them an invite to start the "hangout"
When you are connected with them Click on the Video Camera Icon to start a Video Call
Choose to allow Google Plus to use your camera and microphone on the computer
Allow to turn on the webcam
You will see yourself in the webcam
If you have a powerpoint to get it to look right open "Power Point" go to >Slide Show>
Choose to Browsed by an individual (window)
Click on Presenter View on Power Point
Click on Screenshare to share the Power Point with the "hangout"
Choose what screen your want to share
When you want to switch back to viewing your full screen webcam click on Stop Screensharing