Re: OOC Yes
with your start, you do not have a physical shop. you would make goods and sell them in the market of whatever town you are in (in this case, port town).
If you buy a building in town, you can use it as a shop (feel free to use any rules in official paizo, or 3.5 strongholds builders guide, to accomplish this)
Alternatively, you can make a shop just outside of town (think like how merchants use to make trade stations outside of town to avoid local laws and taxes, also picture refugee camps with trade involved).
Once you have a shop, I will make you a thread and also include your goods in the port town public thread.
for a shop outside of town, you could just as easily set up a tent or just put out your wares on the ground.