Im just wandering into the world of print, Im going to be making slick sheets(8.5x11) for a company, they need to be at a very high DPI, the max is 1200, but if you make a new document in photoshop thats at 600dpi is 5k pixels wide, how do you work at this size? Im finding it almost impossible.

Can I just make it at 72 DPI then blow the image up to 600dpi? Will it turn out well?

Any advice would be greatly appreciated.

Thanks,
-Mike