Help my 94 automatic 4 cyclinder is leakin oil I'm finding under the car could or sould I replace the oil pan and how

I would first clean the engine to determine exactly where the oil leak is originating. It could be the oil pan gasket, valve cover gasket, sending unit, etc...
Gunk makes a decent degreaser (just follow the directions on the can). Once the mess is cleaned up it will be easy to find exactly what is leaking and continue from that point to replace the leaking gasket/component.
If it turns out to be the oil pan, you will see the bolts that secure the oil pan to the block from underneath the vehicle. When replacing the pan with the new gasket it's important that you torque the bolts in a cross torque pattern so the gasket has a chance to seal on all sides.

Not oil pan but gasket remove oil pan scrape off all old gasket and put on new one the best thin to do is glue it on the oil pan first and let dry with bolt holes in line the glue it to block but this might no be the problem headgasket could leak oil pump gasket valve cover gasket