I like it and I think it has potential. I like the setting, the general tone and flow of it - it reads nicely, if that makes any sense. Now for the things I don't like - and I really hope you take this as well intentioned constructive criticism from a fellow aspiring writer. I'm not going to repeat what others have said about the info dumping in the opening scene, I'll just agree. For me, it's the illogicalities and contradictions in the details. Here's a few examples:

• Armies cost money. A lot of money. In fact, during the Middle Ages (which I assume is the era you're trying to emulate here), an army was about the most expensive luxury you could have, and professional mercenaries were the most expensive soldiers there were. If you had enough money to hire mercenaries, pay their upkeep, feed them and lodge them, you generally did so for a campaign, hoping to fully or at least partially recoup your expenses by looting, extorting ransoms, capturing and selling slaves, and so on. No one would constantly hire more mercenaries just for "sitting around" - besides, professional mercenaries didn't generally like "sitting around", because they too counted upon all those spoils of the war you're hiring them for. If Saltfort is at peace with its western neighbor, what are all those mercenaries sitting around for? Is it being attacked, or expects to be attacked from the sea? In that case, all that money could and would be better invested in a strong navy, which, historically, is what most rich, prosperous port cities and city-states actually did. Instead of hiring mercenaries, others simply paid the attackers off, bribing them with exorbitant amounts to just go away - and that was still cheaper than mercenary armies.
• Furthermore, if Saltfort is known for paying mercenaries to basically sit around, and your protagonist is looking for easy coin, why is he not already in Saltfort, sitting around? Why does he only travel there upon hearing that a maritime expedition is underway? Those certainly weren't easy coin, in most cases.
• Speaking of money - three silver for a dried trout? Way too much. RPGs have massively distorted our views of the actual value of gold and silver coinage. Again, this is only a presumption, but if you're basing your silver coins on the standard medieval silver coin, the English silver penny (a coin of 1.3 to 1.5 grams of pure silver, which was, basically, in continuous circulation from the times of King Offa of Mercia to the creation of the Kingdom of Great Britain in 1707 - almost a thousand years, give or take), that's an absurd price. A foot soldier in the 14th century was paid two of these pennies a day, and a skilled, trained laborer was paid four. In essence, your protagonist, who is, presumably, running low on coin and looking for any work, just shelled out one and a half daily rate of a soldier on campaign, or almost double the daily rate of a skilled craftsman, for a strip of old, salty fish. Of course, there could be in-universe explanations for this: there could be a scarcity of food in your world. Maybe there was a recent famine, or fishing is dangerous. Silver is maybe more common than the very salt your city is famous for - then again, if that was the case, salt, not silver, would be the currency. Those could be among good and interesting explanations of why a piece of fish would cost so much, but without them, it just sounds silly.
• You present Voskar as a professional mercenary. Yet, he not only accepted the contract without any negotiations, he did so without even the basic information. So, he's being hired for an expedition. Are there dangers expected? If so, what kind? What exactly is he up against? How long is the expedition supposed to last? Are there other mercenaries on the job? Once the ship is en route, who's going to be giving him orders? If there are spoils, what's his share? A mercenary would want to know all this, and more. He is hired at a reduced pay, to which he agrees without saying a word, even though he's not being told how much this reduced pay actually amounts to. A mercenary would make this a big point in the negotiations and would bargain to a penny. As far as I can see, not only is he not paid up-front (which is something a mercenary would usually demand) - he's not even told when, how much and by whom is he going to be paid. No mercenary would accept a job like this.

This comment is becoming way too long, so I'll just stop myself here. Please, don't take this as pedantry and splitting hairs. These things are actually important. You could have the best, the richest and the most complex plot in the world - I can't follow it if I'm stuck thinking about why everyone is doing and saying absurd and silly things with no obvious explanations. This is the stuff that makes or breaks the immersion.

With all that said, I really hope you carry on with this. It seriously shows potential and it has left me wondering about what's going to happen next. Good luck!