carriers building

[Najiram]

I have a quest to research the science of carriers, which I did, and then build the building and train 100 carriers.
I know I am new to this game but I cant figure out which building to build in order to train them.
Plz help.

[WaY]

This is first building in military tab. For elves Dwarf Cave
It costs 500 gold and 1000 wood