Search a little bit.. There are many threads on same subject, also Google a little bit.. I'm sure that you will find everything well explained.
Hey even though you are happy already i have something that might interest you as well, since it is always updated and interactive, not like the video. Sorry, don't want to make the video look bad here It just might help you better in the long run. When you go to G+ just join the G+ Helper community. It is made for newbies and people struggling with G+. Just go here: https://plus.google.com/communities/105619967999215909743
Please read this link: http://www.techrepublic.com/blog/google-in-the-enterprise/seven-tips-for-using-google-community-features/2429. Its help to you use Google+ on proper way. Thanks,
Create account in gmail and you will see in the top google+ option and click and automatic account are created in +.
post unique content. Join and contribute in communities related to your niche. Comment and re share other's post. Make as many friends as you can.