I agreed with Dan, timeout, regroup, and definitely get yourself an oil pressure gauge, since I personally don't trust an oil idiot light.
Once you installed the oil pressure gauge, try this method since this is the one I used and it worked great.
I first filled the oil filter as much as I can and then put 3 quarts oil in the oil pan, then I remove the lower oil cooler from the radiator taped it against some pipe so the oil cooler is vertical position. Then place a small funnel inside the oil cooler hose, you will need a Chevy oil pump prime tool and place it inside the Cam Sensor hole; make sure the tool slot is fitted on the oil pump shaft. DO NOT START THE ENGINE, if your oil pressure gauge is electric then just turn the key to the "ON POSITION" , and have someone inside the car telling you that you have oil pressure. Attach the cordless drill machine to prime tool and run it at CCW position, at the same time fill the oil cooler hose with about 1-1/2-2 quarts of motor oil, or until you have oil pressure present. Once you have oil pressure, re-install the oil cooler hose back, set the cordless drill machine to CW until the other person inside the car tells you that you oil pressure on the gauge.
If you still don't have oil pressure showing on the oil pressure gauge, start to see is the oil pump shaft split tabs is still intact, or if the oil pump is damage.