Conditions: provide children's calligraphy counseling on the first floor of the community (not disturbing the people).
Costs: rent (if your property only has daily water and electricity costs), stationery (preparing lessons, without students), your own time and experience.
Benefits: tuition+respect from parents and students+satisfaction brought by students' good grades.
There is an exhibition version of a calligraphy class run by a friend on my website. If you are interested, welcome to communicate.