Well, the game is based on the history of ships. In this MMORPG, you can travel around the world and explore new things as you adventure. You can level up your ship, as far as I remember I think the max level is 10. You have three types: Adventure, Battle and Merchant. Each type has it's own speciality.
For skills, you have a lot. Skills varied from Ship-Building, Mining, Lumbering, Alchemy etc. And with these skills, you can only have a max of 7-9(Can't remember) So you need to choose carefully on what skills you like to learn and train.
The concept is basically the same as any other MMORPG but on a ship. It does have a few cool features but later on it gets too grindy and you'll notice it's just like any other MMORPG like I said. It's much harder to train in land battle then it is on ship. For quests, theres quite a lot. Each city has it's own set of quests.
Hope this helps.
"If you greatly desire something, have the guts to stake everything on obtaining it." - Brendan Francis