Use different device and ip address to add review to the local listing we created. Rate them and put some useful comment.
Do 2-3 weekly on different local listing please focus on Facebook & Google Local
Here is the example which you can add reviews on Yelp – How to Add Review to Yelp Business Page
Here is the example which you can add reviews on google local for business – How to Add Reviews to Google Business Page
How to Add Review Google Rich Snippets to WordPress
More info: http://moz.com/