I always assumed this game is free to play, but is that also really the case, or should you buy it first?
The BZN will be mineable by just playing the game.
The only thing you have to buy is a warrider vehicle, then you will be able to be able to drive around the wasteland and collect the BZN.
Once you have BZN you can either use it to upgrade your garage and weapons, or you can sell the BZN to the exchanges.