Trading is *always* done ingame, the trade is however often setup on the forums

Bulk goods are easily transported through the use of Large Chests (the biggest carriable container) and a boat which you put the two chests inside, lift, and then teleport using Crossroads setup between villages.
If one needs transport several hundreds of items, you just teleport back and forth, loading and unloading the boat. Or you can bring a friend or two to get it done faster.
Both wooden chests and Large Chests require metal though, metal can easily be gotten by trading it with nearby villages buying forageables/linen/bricks.