First off that looks real good
Now the butt and shoulder are the same cuts, so no worries there.
As to the Money Muscle the best way I can describe to find it is the bone points to it.
Look to where the thin point of the bone points and at the other end of the butt you'll see a round piece of muscle, that's the money!
Let me see if I can find you a pic or thread that'll help you a bit more
is a great thread with pics for you