Deploying Ruby on Rails 2.3 on Production

Am sorry for the noobness for this,

I am developing a ruby on rails application on my ubuntu 14.04. As for development, i'm starting my application using ruby script/server. Ruby -v 1.8.7 Rails -v 2.3.14 MySql

Now my question is how to deploy this on production? Am planning to use Ubuntu 14.04 Server as well.

I read about the Phusion Passenger but I did not understand what is that for.

I was hoping to make the ubuntu server as a localhost. So that if I point to the browser like myrailsapp, my application will be available (Normally I will use script/server). Do I have to use the script/server command everytime the server will restart?

Please tell me if im on the right track.