Take a look at our guide to make your app available on Fire TV:
Your app won’t automatically be available for Fire TV, you will need to target these devices.
As for whether your app is supposed to be a web app or an Android app, I would recommend talking to your app developer, as this depends what kind of app you’ve developed. If you accidentally created a web app, when you want to release an Andorid app, you will need to create another app, but you can use the same app title.