glossy print finish for printwork mockups

Hi,

I am doing some cycles mockups for print work such as stacks of business cards, flyers, books …

I was wondering what the best method is to have a touch of gloss over them. Do i use only a glossy shader or combine it with a diffuse? Do i add my textures only to the diffuse (with plain white for the glossy shader), or to both shaders? How to mix them? …

Any tips or examples are welcome!

Many thanks!

Matt