I think you need to register with immigration and the local Board of Education to get a Tutor's license. It is not too difficult.
Korean American offering English lessons and essay review
I am a Korean American from Seattle with an F-4 visa. I am native and fluent in both English and Korean. I graduated from University of Washington. I was previously in the U.S. military and diplomatic service. I offer intermediate to advanced level English lessons and essay review for adults and college students.