Ok... Basically, you would be a pirate in the world. You'd sail under one of the six moons and take what you want, explore places, and fight an evil empire for control of the skies and your freedom. That's the basics. You would have to master steel, ship, and firearms, as well as magic to be the greatest pirate who ever lived.
Or, you could be a captain in the empire, tasked to bring these law breakers and fagrants to justice as they prey on honest, hard working people. Though, there is a lot going on in the Empire you don't know about, and you'll likely get caught up in it if you aren't careful. You're bound by your duty, but can you resist the freedom of the pirate lifestyle and work for a better future for everyone?
That's it in a nutshell.