Google + is great for increasing brand awareness and increasing traffic, but you will need to build up your network circles and update the page with fresh and regular content posts.
Set up a google page for business embed a + 1 button on your website for people to provide your site content, article video etc. with a citation the more you get the better Google registers these as how popular your content / brand is which has an impact on your SEO..
Go here for more info on why you should have a google page for business http://www.seomoz.org/blog/why-every-marketer-now-needs-a-google-strategy
To setup a page visit : http://www.google.com/+/business/
for step instructions see: http://www.socialmediaexaminer.com/how-to-set-up-a-google-page-for-your-business/
Hope this helps, Good luck