How do you set up a package deal shop?

I can't seem to figure out how... I have asked numorous people, googled it, etc. and still nothing :P I am lvl 52 and I checked the little box at the bottom that says package... what else do I need to be able to set up a package shop?

Thanks,
Itchy

lol, nvm. Was trying to sell more then 3 items. Someone told me I need fish tickets to be able to sell more then 3 items at a time... what exactly is he talking about?

You can exchange fish tickets for expanding your shop, warehouse, or craft shop. I think you need to talk to the fishing guy to do that.

By fishing you can get Proofs of Catching a Fish. With 10k of this proofs you can go to the Fishing Guy in each town and ask him to expand your trade mastery. That will add one more slot for you to sell items.

Also, if you want to sell items, I would recommend you to use an alt dwarf, since they have 4 slots already.