New guy here and to the brewing scene trying to put my chemical engineering degree to good work (other than working for the man). I want to do a chocolate coffee stout, starting with a base of an Irish stout kit, and was wondering your opinion on the best way to accomplish this. Example - when I add the coffee, is it whole bean or ground and at what point in the boil is this added? Also, what's the best way to impart a chocolate flavor into the beer, with a malt or do you guys have other secrets? Let me know if this is too much manipulation on a kit, maybe I'll have to do one or the other.
TL;DR - best way to add a coffee and chocolate flavor into a part extract/specialty grain Irish stout kit.