How to Battle with our Heroes?

I don’t really know about this. I saw all hero has different HP and Strength but how to use it in battle? I saw in beginning intro game there were a battle and it seems really fun. But since right now i don’t know how to do it

-Heroes control units/army.
-Hero sent with units to attack is known as commander hero.
-The talents and skills of heroes affects the power of units.
-HP/armour not useful in battles but other stats such as strength,dexterity,intelligence,etc also affect a bit(only a bit) of power output.

You can attack that white building in centre of kingdom,other players doms,etc

For now keep playing the game and soon you will be able to attack others and go join some good guild,they will help you out.