Leaking a lot of oil

We aren't going to be able to solve this because we can't see it. If you don't want to get a mechanic involved, since the leak is apparently bad enough you might ask at the auto parts stores that borrow or rent tools if they have a smoke machine. They run on the car's battery and produce a white, non-toxic smoke at 2 psi. You can inject that smoke into the dipstick tube, then watch for where it sneaks out. That will work fine for non-pressurized areas like the oil pan and valve cover gaskets. It might not work if the leak is from a pressurized area that requires the engine to be running. Passages after the oil pump are the suspects there, but there aren't many that will leak oil outside the engine.