Print on demand example template - HELP

Hi guys. I’ve been struggling all day trying to figure out how to use the template/code of the print on demand.
I have issues because I can’t access their database in the example or the datasets.
So I’m really looking forward to someone who can help me a bit on:

  1. how do I connect my item in the store to that dynamic page ?
  2. how do I set the product in the store for that ? or do I have to make a new one ?
  3. How’s the mask trick work ? can figure it out on the example
  4. can’t see the repeaters used in the code

I would really appreciate a step by step tutorial on it, for my business it is important.
I’m willing to pay someone who can help me out.

PS: I checked the site for it, found some info, but not what I’m looking for .

Thanks a lot in advance !

Anyone ?