Perfect, you have a marketplace, but still need troops that are capable for goods transportation. Carts (trained in workshop), each can carry 150 resources. Note, that only troops located in armies without fixed squad mark can be used for trade. Also note that it will take too long to build 20 carts in a row one-by-one, so it is recommended to upgrade your workshop to level 4 (to train 4 carts at once), 9 (9 at once) or 10 (10 at once)
Hints: First, you need to build workshop. You need castle level 6. You need a free area around for future expansion, and train 20 carts
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