Make sure the mating surface is nice and flat and clean before installing the drain plug and make sure its tight.

Lube the caliper slide pins too

Pop the hood while running and watch all the pullys, next remove the belt and spin pullies by hand and inspect for wobble/any high spot. Next id inspect the belts tension, either try to move the tensioner belt off or pull on the belt while its on(not running)

Any weight will lower the car by some

Check the dipstick, if its dry, start praying