1998 Dodge Intrepid My car blew a rod. So I was told!

Engine Performance problem
1998 Dodge Intrepid 6 cyl Two Wheel Drive Automatic

I was told that my car blew a rod. Cause it won't start imediately anymore unless I play with the gas pedal when starting it and when I am driving you can hear the rod knocking against the engine. It happened when I found out that my car was low on oil but when I checked to see with the problem was it has very little oil in it. What is the problem and how much would it possibly cost me total?