How do you get the helpers on Skullduggery Island in poptropica?

Answer 1

ok so there is your original helpers (cabin boy & cook) then you have cargo master (+cargo space) shipwright (auto heal) cannoneer (reload speed)

navigator (ship speed) so all up there should be 6 (six) helpers in your boat hope this helped

Answer 2

You get helpers by going to different islands on the map and looking for "people with talent" and hiring them. Most cost from 10,000 to 20,000 to hire.