Print on Demand Template for my warehouse

[printerversesho]

Hey everyone.

I own a warehouse with machines capable of delivering all kinds of merchandise. I have 2 questions:

1) I see many print-on-demand templates using something like Printful or another source, how would I use my own warehouse, going to my own label-printer instead of relying on another company to source my products to? (It would all be in house)

2) How would I go about making my warehouse available to users to use my print-on-demand services from my shop? I would love to create products for people and handle everything for them.