any troops can carry gold, Supply troops and supply wagons can carry much more. click on where you want to send old, your other city, someone in your alliance, or a friendly alliance. Click on transport, if transport isn't there you can't send them anything. Notice when you select troops it tells your load capacity. They do not require a knight to go with them. Then click march. Make sure you upgrade your rally point. at level 1 you can only send out 1 party at a time.