Ship Type & Ship Building
Raft Junk Warship
Nautilus Trireme Galleon
Budgerow Nave Battleship
Building Ships require some material.
Hunt pirates at Naval Scene to gain the specified material.
Beside Materials, Ship Conceive are required too. You can obtain the Ship Conceive by completing Naval Scenario Progress.
You can see the required Materials and condition of building a Ship at the Dockyard.