Expend resources to explore new territory, your nations source of revenue. The price of land increases as nations purchase it throughout the game.
Use your scientists to brainstorm and name new technologies. Completed research becomes available to your engineers.
Use discoveries from your scientists to engineer new weapons and defenses for your soldiers and gadgets for your spies. Then call on your labor force to manufacture them.
Use your expanding military to attack other nations and conquer their land. Use your spy network to carefully watch your opponents movements and steal their technology.