start with a greyscale(black and white image)

image>mode>duotone

in the drop down menu click duotone

once in duotone, click on the black square, and a colour pallet will show up

click on colour libaries and pick pantone

choose your colours.

for a sepia feel use browns

now that the colours have been picked.

click on the colour boxes

now play with the duotone curve.

make the colours lighter or darker.

now your image is complete, to save it.

Save as> photoshop pdf