Once you create your profile on Google+ and begin to share updates and interact with other plussers, you will begin to attract followers. Other Google+ users will add you to one or more circles. If you're using Google+ for business, then it's important that you continue to attract more followers so that when you share content regarding your business, more people see it.
If you aren't yet using Google+, or aren't logging in regularly, the social network may seem a bit intimidating. It's different from Facebook in a lot of ways, and there are a number of features and nuances that may not be obvious how to use or what you're supposed to do. These are perfectly understandable stumbling blocks to using and getting value out of Google+. The thing is, particularly if you're in business, Google+ is rapidly developing as the premiere network!