Easy as anything can be!!
Step One: Win the Lottery.
This shouldn't be to hard I mean what are the odds anyway?
Step Two: Take your millions and find a ship building company.
This you might have to google.
Step Three: Hire them to make the ship.
Or why did you google it?
Step Four: Pay them.
They can get mean.
Step Five: Learn How to sail it and go have yourself a pirates life!!