All of the above suggestions are right on. This is not meant as a tutorial but just as another alternative, maybe something will click for you when you try this:

MaterialRoom/NewNode/3d Textures/Granite
You can play with how many shades which will alter the look or bumpiness of your leather.
Plug it into your bump channel with about a .003
Plug it into your displacement channel with about a .001
Alter your diffuse color as appropriate.
Not meant for upclose work.

Hope this helps

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