I just finished adding in docks. They will be the most basic version of a port. You will be able to build fishing boats from the basic one and military ships from the larger versions.
At this point I'm planning on adding in fishing boats, catapults, and maybe watch towers and messenger stables before starting the next game. I am also trying to document all the buildings and functionality of the game in a player guide that you can find on the menu to the right. Hopefully this will help the new players in case they have trouble.