HELP! I bought a mess?

Smoking. Everything leaks, BAD. Most disturbing is there is an unmixed coolant leak at the back passenger side of the motor running down the scatter shield on the trans that I can confirm is not coming from the head so must be coming from one of the freeze plugs on the back of the motor under the auto trans bell.
Well, then this pretty much makes it easy. You'll be pulling the motor and sounds like a tear down. That will take the guess work out of all that you have. Welcome by the way! :)