Download link :- http://bit.ly/11shabd
Generally the game uses Coins, Rubies, Pearls and a few other gems. The Coins are the main currency, and used to buy most things.
Your buildings will all pay in coins over time. The higher the level and grade the more they pay. Pearls are used to upgrade your merchants and Ships.
Upgraded Ships and Merchants pay more loot. Remember though that Upgraded Ships also are more costly to send out for a voyage. There are other items you will get as you proceed further into the game
Energy: You have an energy meter in yellow on the top of the screen. Actions like cutting trees and getting fish will run your energy down.
If your energy runs down you can fill it up with rubies...or shut the game off for awhile and come back later when your energy is refreshed.