95 Voyager Leaking Coolant, Thoughts on problem

I have a 95 Plymouth Voyager which has abouit 115k miles on it. Aside from leaking coolant, was said to be working just fine. It has been sitting for about 2 years now, but started up perfectly. I have been dumping water in to try and track the leaks. I believe the water pump to be bad, but it is also leaking from the rear part of the engine. Was told that it is probably the Freeze Plug, but I do not know. Can somebody tell me where to look for the plug so that I may check to see it's condition? It seems to be leaking from the rear of the engine, at least (or around) mid-way up, but could not see very well past there. I did not want to go digging in to it if it is something big as I do not want to dump a whole lot into it. The engine makes NO noise, runs at a steady pace, so really do not think it to be anything big like the block. Anyway, suggestions on where to look for the plug or other ideas would be great!