Working the Asteroid Belt
I'll get some specifics posted when the time comes, but working for a living on a ship (as opposed to adventuring/privateering) takes a bit of work and managed expectations.
First, if you're broke: You need to hire out as a delivery service. Someone else's goods and profit. If an overseer goes with you, it likely includes a round trip, which is a bit more income, but there are daily expenses. Food and water. By this I mean REAL food. not goodberries, especially with passengers. And a return trip means the same expense again, possibly with no cargo and no payday.
Speculative trade: You can decide to try and initiate trade with a dwarven mining enclave or a half village, but... what do they need/want? and is someone else already bringing it to them? They can't pay twice, and may prefer the merchant they know. Now, delivery service work is a good way to make contacts. but even after, you need to know your customer.
Dwarves will likely want food, maybe bulk wool of various sorts. Maybe wood, too, but decent wood supplies takes a big ship. Usually a modified longship. They can pay in gems or metal goods, or even metal ingots, possibly. Of course "metal goods" can be anything form weapons to farming equipment, and it matters which.
Hoppers will want tools and cloth, too, and not necessarily just farming tools. They have smiths and brewers and masons and etc, too. Well, usually. They have fresh meat, fruit and veggies to trade, and maybe some spare wool. Fresh, mind you, so I hope you're heading to an assured sale directly from there.
Hermits probably don't want you to bring them anything.
Wizards are going to have specific ideas about what they want, and are likely to have a permanent supplier handling things for them. Hard pressure door-to-door salesman are why they invented Magic Missile.
Rich idiots making their own asteroid fiefdom on a rock somewhere with a small village to take care of them will want their luxuries. The villagers will want tools. The idiot will have gold, the villagers will probably be broke. Maybe a little spare food.