I don't think there is exactly a standard when it comes to teaching drums..
it really depends on where ur gonna teach..
If in public schools, some form of recognised (eg ABRSM, Trinity) theory and practical would go a long way..
In most commercial music schools, recommendations by other teachers and professionals, as well as reputation are the main criteria..
Some more established schools like Yamaha require certain theory background as well as an audition and written paper...
In a Arts College (eg. La Salle, NAFA, YST consevatory), you will likely need a music related degree, or be extremely recognised within the professional circuit.