Spot Designing and printing

I need some help with this.
I’ve been asked to design an ad using principals of spot colour printing and design
i know what spot printing is but i’m confused about how i should design for it,how do i choose colors etc?
would appreciate any sort of input on this

This site mostly populated by product designers. Try this forum:

Not only are there tons of graphic designers but many production artisits as well.

thank you!