Resources

Storage
Gold Storage rooms can be built, to buy each room costs 300 Mana.

Mana Storage rooms can be built, to buy each room costs 300 Gold.

Gold is also stored in the Throne Hall and with Goldsmiths.

Mana is also stored in the Throne Hall and in Mana Wells.

Production
Mana can be obtained through attacking others or by pulling it from a Mana Well. Attacking will grant Mana faster but it is also riskier.

Gold can be obtained through attacking other or by gathering it from a Goldsmith. Attacking will grant Gold faster but it is also riskier.

Both resources can also be obtained by purchasing with Rubies or by the Armored cart that delivers resources after you have defeated an enemy.