first, the bottle is created, just the same as any other bottle. The tricky part is inserting the ship. the ship must be made in a way that the mast and sails can be collapsible so that everything can fit through the neck of the jar. once the collapsed version of the ship is inside, it must be erected and the masts glued in place. This takes quite a bit of skill from the person who made the ship.
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There are kits which you can purchase the material to build your own ship. It also comes with the instructions on how to assemble the ship in the right way and then to put it into the bottle.