You're missing the Acrobat step. There is no way to do all that in InDesign. You make the PDF, open it in Acrobat, then do the distribution of the form from Acrobat. Read about it in the Acrobat Help.
In Acrobat, you go into Form Editing; select your Submit button and edit its action. In the Submit a Form action, you can choose to upload/post the FDF form data in various ways. This only moves the form field data up the pipline to your MAILTO email address. You can also choose to upload/post the entire PDF. But you cannot choose to post only one page of the PDF.
I'd like to be able to create a checkbox on each product page that then custom populates the order form at the end ready for quantity input, but I think that will be way beyond what's possible.
There is a basic guide here: http://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/Acro6JSGuide.pdf
Does a form have to be on one page of the PDF, or can it be distributed across the 16 pages? I have never tried to build a form that contributed from other pages in the PDF.
The scripted references to other fields are only reliant on the field name(s). The page they're on has no effect, so they don't have to be on the same page.
Thanks John, I didn't know that!