I am playing on the Beta Server. If you enclose you Storehouse, you will not be allowing to trade goods. You have to have a GATE in the Wall.
Tip
When you first start the Game, Move your Storehouse next to the Castle, and leave Space to put your Market, and Rally Point. Build walls all around them. A 3x4 Squares Area. You can build wall around your entry points if you want a Second Wall. All this does not need done ASAP, but Plan it out so your not build others things in the way.