Hi Sarah
You will end up with two Google + pages, One Google Business Page and also a Google+ Page.
The Google Business page is very important as this is the one that will be verifyed to your website and old Google Places pages. It is very very confusing. All our posts on Google Plus go to our page and not to our Business and there is no way to join the too
Google have just launched a new update which starts to map locally to Business pages via local search, for example Timberyard London. This then also brings in all your Google+ Business info, maps etc. Join a few of the groups and recommended is "Google+ Resource", you have to request to join and they are really helpful. Create circles and share content from your sites via G+ on your site. Google Plus is very much part of Google search too, so if members of your circles are logged into Google plus too, then when you post, you posts up in any related search results, normally quite high on page 1.
Worth researching and learning more to get the most out of G+, as it looks like it is going to be very important in Googles effort to keep content fresh, new and unique.