there is no such thing as an ignorant question, that's what the forums are for. as far as the cooling system goes, i'd find you a rubber ball to plug the lower pipe on the engine, and fill the thing up with water from the hose on the outlet. fill it up then pop the ball out, let it drain out, rinse and repeat for a while. once it runs clear then put the radiator on. once the engine and radiator are ready to run. throw a gallon of vinegar in it and top it up the rest of the way with water and drive it about half an hour. pull the bottom hose and watch in amazement at what comes out. let it cool down completely then rinse out the system. mix a cup or two of baking soda in a gallon of water and dissolve it. pour it in the radiator and top up with water. run it again like before. the baking soda neutralizes the vinegar and keeps it from eating stuff you don't want eaten. but the vinegar will attack all the rust scale and dissolve it letting it come out. the Mississippi river will flow out when you drain it of vinegar.