I want to make my own brand but i dont know how to put the pieces together and i would like some help thanks
There are places where you can buy already made designs and stock artwork. Like http://www.tshirt-factory.com/
But anyone can buy these and if you are putting your own brand together you should get your own designs made.
Check out emptees.com or designers or find designers you like through websites like threadless and design by humans.