Contract of designs for t-shirts

I am looking for 2 t-shirt designers to establish contract for providing us contemporary artworks to be printed upon t-shirts. Designs should be appealing to youth. I will provide the design category or theme and you will provide designs related to them. We need at least 200 designs every month. You may be delivering designs every week. Designs size will be of A4 size. We will need designs in png and eps format. Since we would have contract so we are restricted to only Indian designers as our business is in India only. Please remember we are not looking for beginner designers.