1994 Geo Prizm Oil leak

Is your drain plug in? You can take the car to most repair shops and they will add a substance to the oil, you drive the car for 150 miles, then they look at the engine with a blacklight to isolate the leak. Usually, front and rear seals, oil pan, valve covers, cam seals, distributor seal, spark plug tube seals etc. The real expensive one is the rear main, the transmission must be removed.