First, things first. Choose your service. If you do not have Starz through your cable and just want to buy into one of the apps. Get the app via the three above options. (click above).
In iTunes and Google Play you will download the app for free and then buy into the $8.99 Starz package inside the app.
And you can start watching today because Season One will be available and Episode 1 of Season 2 is up right now.
But if you have the service through your cable provider....