I want to know if it is possible to do the following;
I want to have a nfc tag that works in conjunction with an Android application that I am developing.
If
I think that this is what you are looking for:
Tutorial NFC.
If a user without our app touches the tag, it’ll use a built in mechanism to take them to the download page for the app in the Android Play Store. Once installed any subsequent taps will launch the app and show the game card on screen.