sublimation tool or t-shirt design

Hello homies, I was actually looking for someone who can help me or please guide me through the process of putting sublimation of t-shirt design tool or t-shirt design page, where anyone can customize the Design as per thier need. For example. I have hooked up some sites. It's urgent. Please help me.
http://www.elitesportsdyo.com
https://en.owayo.com/konfigurator_html/index.php?sport=football&product=shirts_f3&lang=en&land=wo

Thank you all.

Hi! Take a look in this site.
There you will be helped.
https://www.t-shirtforums.com/