Because your coolant is outside on the ground and apparently leaking from the water pump, you probably just need a water pump. The procedure for changing the pump is described in Chilton'* 28200. You can buy one at almost any auto parts store for $15-$20, or if your local library is a good one like mine, check one out for free. The procedure is a little messy, but it is not that difficult.
 Oh yeah, your car has a plastic coolant bypass elbow that can crack and leak that is in the same general area. It connects the bottom of the lower intake manifold withthe belt tensioner assembly. It would be a good idea to get a mechanic'* mirror and a flashlight and look carefully to make sure it is not your problem.
And, a bad water pump can sometimes be diagnosed by looseness of the pulley, more obvious with the belt off.