http://www.fanfiction.net/s/5593724/1/TheDarkestOcean

This story is in the one piece universe, but 500 years after the manga so you don't have to be too familiar with the canon. Basically a second pirate age occurs, only on a grander scale than before. While the strongest pirates travel space searching for a planet's worth of treasure left by the last pirate king, Lieutenant Mark Wagner deserts the marines to form his own pirate crew.

This is my first fanfic so give me some tough love