Paper Design Question

Hello, I am new to design but have many ideas and one of them involves creating a large poster for retail approx. 12 sq. ft. but im not sure how to begin im not sure what type of paper it is either but its exactly what im looking for.

It was the new August poster sent by Veer to my house and I emailed them but they wouldn’t tell me how they obtained it. I posted a pic below also how do I make the graphics fit, should I have a designer create the graphics in a certain format.[/img]