Beyond Apptio University, I can't think of a better recommendation. Great idea, @Eric Chan!
On second thought, you may want to sketch on paper a cost model for your client company, Things to consider: main cost drivers, consumers, obvious data sources available, etc. That would give you an idea of what to look for in CT.
At first, the problem is not the
how, but rather the
what.
Buona fortuna!