Your app will be ready to go. So there is no technical knowledge required.
The first step will be to promote the app through your existing friend network, conveniently this function is built into the Facebook page.
Encourage friends to create a search so that results appear in their feed, this will start to grow the app to friends of friends.
Every person that installs the app, helps in the social advertising.
Then, create a Facebook ad to get the ball rolling to new business, the way social networking works, it grows exponentially from a small seed.
Facebook ads are easy to create and easy to target to a very specific demographic. Plus you only pay when people click.
You can link your app from your business page in Facebook if you have one (you may wish to use the Application page as your business page instead) and of course, you can link the app from your existing website as well. Every person you can get to install your app is a person you will stay in front of daily or weekly effortlessly, and will spread the app in the network.