Well, he doesn't run guns. Not intentionally anyway.

There will probably be more backstory as time goes on. But for now, he wanted to be an independent shipping captain, likely from back in his school days at least, but ended up working for someone else, due to having to pay off the loans he had to take out to get the ship. Not a ton of backstory, but more than it started out with. It establishes a dream, a drive, that he's working towards.