New Blockchain themed simulation game,

so basically i have an idea for a multiplayer mobile game where you create a nation with its own crypto currency and your aim is to become the biggest most valuable nation in the game,
you can build alliances, go to war with other nations or keep the peace.
basically a sandbox world driven by the players.
this will be a turn based simulation game filled with other users from around the world.
chat, build laws and agreements with other nations and destroy those who try to stop you.

i need some help on where to begin creating such a game.
thank you