Urgent ~~ do tender offset A3 short edge Cover how to print and set ah?

Photoshop to do the cover and size, canvas size to change the cover canvas size, book thickness +2CM indentation. +2CM wrap around each side. I do not know what your printer, the driver is also a little different, but as long as the paper size, direction, and image direction, scaling can be. Professional should use montage output simple and convenient.