I don't think you will have much luck using Nutella in its packaged form. If you add it to the secondary you should for sure get a stuck up keg. I am brewing something similar and have used one pound of toasted hazelnuts crushed up in the mash.. I got a very pleasant toasty hazelnut flavor, so...
A buddy and I have just started home brewing and its already become an addiction. We have just bottled a Belgium Cherry Wheat and are now planning on starting either a Grand Cru or Kwak type of beer.
I have since purchased The Complete Joy of Homebrewing by Charles Papazian and have been...