Sharing useful information to your circles to increase followers. It's great way to increase followers stable and fast.
I tried to share useful post on https://plus.google.com/+Webmastersun/posts and got more followers in short time.
G+ channel works as the same like Facebook and Twitter. First you need to add yourself several (more) so you can get some to follow you back. If you get lucky you will get some high respected members that when they share or like something others will bump over that page and share it. Those are influencers and are very very good !
You can increase the Google+ follower by joining the various group related to your niche and post there interesting post. So that others are like that post and start following you if you provide than more interesting stuff. This is the easiest way I find to increase the Google + followers.
Firstly, focus on writing quality content.Secondly, focus on writing some more quality content. And thirdly, add some more quality content to it. When you're done, keep doing it for some time. A long time. It may sound boring and it is. It may sound demanding and it is. But it's also incredibly effective.