As per my experience am suggesting some good stratagies to promote your business..i.e.Create one good business profile, increase your community, Post some informations about your business, Share this with your followers, Increase your followers, Adding More Friends etc...
To increase Google+ page follower, you need to create an attractive and informative page first, after that you need to increase your friends in Google+, share this page with them and ask them to share this page with their crowd.
But this things worked for me..
1.Do comment on related post.
2.Follow other profiles.
4.Join public groups related to topics.
5.Follow back to your followers.
6.Send Google+ invitations to your email contacts.
7.Mention influencers in your posts.
8.Search for hashtags relevant to your business and use hashtag in your post.
9.Create and share comprehensive circles.
10.Embed a Google+ badge on your website or blog.