Here is a link to a few tutorials:
Ordering~
https://www.zenfolio.com/us/z/help/support-center#/customer/en/portal/articles/408213-how-to-buy-photos-and-products
Favorites List~
https://www.zenfolio.com/us/z/help/support-center#/customer/en/portal/articles/782852-creating-editing-and-sharing-a-set-of-favorites---for-visitors