Marketpress Payment Settings

Hi,

I am getting ready to offer stores to my users and have a question about payment set up. Does everyone who signs up and creates a store have to setup all the Paypal info? I am referring to the API Credentials. Do you have any documentation on what they will need to do? Also, as far as instructions do you guys have anything I can link to help them upload their first products and launch their store?

Thanks for everything you do!
Andy