Have you seen the catalog example, store.pdf, included with the Acrobat distribution disk?
It consist of pages with the image and description of each item and a button. The button adds the item to the order form and takes the user to the order form so the quantity and other optional data can be added. If the order sheet from the sample pdf is sent as an FDF it would only have the fields with data or selected fields with data. This data could then be opened in a a pdf of just the order sheet. When using a web server for the submit process, one could return just the oder page to the user.