well you have C,D,E,F,G,A,B, when you get back to see your in the next octive.
so the first set(starting from the lowest end) would be C0,D0,E0,F0,G0,A0,B0, then on to C1,D1,E1,F1,G1,A1,B1 and so on, all the way up the keyboard.
the number represents the octive number.
correct me if im wrong, but that what i know.
hope it helps