THIS is what you should be getting. Wrath of the Lich King can wait for a while. THC (imo) is essential.
And yes dude. It will. That picture is of the two copies i own. The setup included in the CDs works for both MAC and PC. Heck, my cousin owns a Mac, I installed WoW on it using these CDs.
You could always download it though, all you need is the keys to make an account.