To upgrade your troops, collect the required resources and visit the barracks. Tap on the troop you wish to upgrade and follow the on-screen instructions.

Yes, you can change your empire's location by using the 'Change Location' option in the empire management menu. This allows you to move your base for strategic purposes.

The best strategy involves balancing offensive and defensive measures. Strengthen your defenses first, then use scouts to gather intelligence. Plan your attacks carefully, targeting weaker opponents or those with less defensive strength.

Increase your army size by upgrading your resource buildings to produce more resources faster, which will enable you to train more troops. Also, consider researching new technologies that boost your production rates.