What documents does Dongying live-in nanny need to take care of the elderly?

Need training, professional certificate, it is best to have many years of work experience, my aunt is doing housekeeping training, and my domestic nanny is also their training school. I have studied many courses, such as nutrition collocation, caring for the demented elderly, health teacher certificate and teacher certificate. I feel good, because the old man is old, his children are busy, and the old man needs company very much. I think this kind of family nanny is really good, and I mainly need to find one.