He is at Bouffant Bay in the warehouse. You can hire him for 15,000 doubloons (one-time payment), and he will increase any ship's cargo space by 50%.
The Cargo Master (Bouffant Bay) increases cargo space of any ship by 50%.
All you do there is to hire the Cargo Master, when you can afford him (salary 15,000 doubloons).
You can get doubloons by sinking other ships, monsters and by selling cargo.
You don't. The only thing in the warehouse that affects the game is the Cargo Master, a skilled crewman you can hire for 15,000 doubloons. He increases the cargo capacity of any and every ship by 50% once you hire him.
you go around to each place and sell your cargo
TO do that, you must trade to other islands like the five islands. To trade them, you must go clockwise, island to island then see this chart which says the island, thing that suppose to be sell and to be buy. Do this orderly and don't forget the Loan officer. Ask money to her and she will give you but you need to pay her that money in 20 days.
You have to defeat ships and sea monsters and pick up the cargo that they leave behind when they sink.
"Cash" on Skullduggery Island is your doubloon count. You earn doubloons by salvage or by trading, and you can borrow some from the Golden Harbor bank. When you buy cargo, you spend your cash, and when you sell it, you make a profit. If your ship is sunk, you lose aprt of your doubloons and part of your cargo. You need doubloons to buy larger ships and hire skilled crewmen. (see related question)
skullduggery island!
Fort Ridley is the first place you go on Skullduggery Island. Its impossible to miss it.
Bouffant Bay is located northeast of Fort Ridley on Skullduggery island Poptropica.com
The bank on Skullduggery Island is the Golden Harbor Bank, located in the Arabic-themed port at the lower right on the island map.