In the Barracks you can recruit infantry, The higher its level, the faster the recruitment of infantry will be finished. The requirements are level 3 headquarters. The maximum level of the Barracks is 25. Here you can recruit spear fighters, swordsmen, axemen, and archers.
See Buildings for other information.
It is often best to build your barracks while you still have beginner protection. This can be achieved a few hours after you start.
Tribal Wars Building Help thats how much it costs to build