need help or advice
 

I have a 2000 mitsibishi Montero sport I was driving down the road about 8 miles after I left the house I just all of a sudden lost power was going 70 to nothing and the steering locked up and all lights popped on and the green 4 wheel drive light flickers. I got the car towed home because it wont turn over It tries to crank but wont turn over. I got it home and started to look at it did the first things I could think of and cked the fluids oil fine transmission fluid fine but the antifreeze was out so I topped it off and then I heard water dripping so I checked to see where it was coming from it looks like its mostly from the coolant expansion tank what I can tell what are my next steps to do??????