The food collected from farms, as well as the one from berries, can't be delivered to Storage pits! After that you will be able to make farms near the Town Center or the Granary. Then you'll need to reach the Tool Age and build the Marketplace at the cost of 150 wood. Therefore, in any Random Map or Deathmatch, you will just need to build the Granary at the cost of 120 wood, possibly near some berries. In the first Age of Empires farms cost 75 wood and you can create them right after building the Marketplace, which requires the Granary.