Question What asset to use for virtual novel and some kind of digital wallet for resources?

Hello.
I would like to make something like virtual novel or CYOA or interactive story game, call it whatever you like, but I would like to use characters on cards, not standard virtual novel images. Something like android game "Lapse: A Forgotten Future", but still different.
Main character can collect, earn and get some resources, and spend, lost resources. Main character need some kind of a digital wallet to store those resources
Because I am new to Unity, I need advice what asset should I use, what should I practice, where to start?
I was checking asset store, but it is hard to pick right asset.
Game will be for Android OS primarily. 2D of course. Story will dominate in the game.
Thank You for advices.