When you get to the main world, fight as many Jelly Beans as possible. If you are not going to be a dealer, sell them for fast money. If you are going to be a dealer, hold on to them until you can make items, then sell them.

When you are in Nooblet Island, kill until you get a lot of Jam +5. Sell them at Zant, then store it at Crow. Then, use your other character and take out your money or items.