Stous recipe issues

I was making a double choc stout, actually a youngs clone, extract. I cannot find Choc extract for secondary though, not without a hour+ road trip anyways, so my question is this, i i were to switch to a mocha stout, does nay one reccomend a coffee, when or how much to add, and how to add it...

Do i cold steep it
Percolate it and cool it
Primary?
Secondary?
How many ounces coffee to how much water?
Just add ground grains right to the beer?

Thanks for any input....

I got mine at Amazon, came here in 5 days. It's the Star Kay White's chocolate extract. I did a Rogue clone and it worked great.

I've bought some nice flavors from Bickford. What I like about them is they are just the flavors without extra crap in them.

Bickford Flavors