Early game you won't have that much health. Stay back (make sure this is top lane. You can mid solo, but not against high AP characters yet) and Parrrley the other team often. Try to focus on the most squishy champion, to get a kill and feed yourself. If you parrrley a minion and kill it, you will earn extra gold. Once you get Trinity force, you can begin chasing like a mofo. Get active in team fights; they will love your ult. Use your remove scurvy as a healing option too, but make sure not to waste it before AOE effects. Then POWN mid and late game. AND HEY!! DON'T FORGET TO JUNGLE!!! Red is helpful, but go for blue first. If you can get both. HECKA OP then.

A freaking OP Critical Pirate who CAN'T be KILLED!!!
You're normal attacks will do over 400 critical damage while your Parrrley will give you 900 critical damage. Your critical chance is like almost 100%. Almost.