oil pan leaks

the self tapping screw is your best option for the long run.make sure you have a magnetic oil drain plug too.if not those are only about $6

Yo can use quick-steel or JB weld to plug it. I wouldn't drill through it because you could damage the oil pump pick up screen. You can go to the junk yard to get another pan if nothing else works. Look for a Pull-a Part near you, they are the cheapest.