"Ahu" are stone platforms on which many moai sit. There are 313 known ahu and 125 of these carry moai. The biggest, Ahu Tongariki is 220 m (720 ft), and had the most (15) and tallest moai.
And I don't have any specific steps to take because I don't start the same way every time. But there is a knowing when it's enough and you can leave it alone.