The qualified person must have good communications skills to teach foreign language. The qualified person must know German, Czech and Russian.
To help a disabled man learn language and recommend software or books.
Berlitz is a very good German learning book. Such text will be provided. The qualified person will have skype or video conference software. Lessons may take place in the evening. The qualified person may act as a distance care giver as a part of his/her duties and have experience caring for a person(peoples).
They may have knowledge of security also.