Hey all, I'm very very new to this and want to make a shirt with my logo on it so players can start with. I need to things 1 I need to know how to make the shirt or have someone make it for me I'm willing to pay...also how I would add it to my server

There are some tutorials out there that show how to make the skins.  Then you upload it to the Steam Workshop and use a plugin to load the skin in the game.