How much water do you drain from the Radiator before you put antifreeze in a dodge Dakota sport radiator 4.7 liter?

Probably all of it. Unless the volume of water in the system is known, it is impossible to know how much to remove and how much antifreeze is to be added to achieve the proper mixture. The correct mix is 1/2 water, 1/2 antifreeze at a minimum, but ideally, the mixture should be 70% antifreeze with 30% water.