I Would need to see whats left of threads to decied witch opption ,
That hole is larger then most thread chasers , but you may be able to find one , [ a thread chaser will reform the threads , not cut - you do not want to use a tap because you want as much of what is still there to stay ] .
The next is also tricky , with the oil pan empty , use some diesel -down the oil fill hole to flush , maybe a qt. or 2 , when that stops dripping , spray with brake cleaner , you want to get this as clean & dry as possible , then use Permatex Thread/gap filler , not the lock stuff [ liquid ] , but the filler , almost like very thin putty , to glue in one of the drain valves avalible for this , [ Geno's garage - one of the sponsers here .