She founded the Missionaries of Charity.
Mother Teresa opened the first Home for the Dying in Calcutta in 1952.
Calcutta
Mother Teresa did not start a 'business' but a religious order called the Missionaries of Charity. It received approval of the pope in 1950. It was started originally to provide hospice care for the poor left to die on the streets of Calcutta but expanded to help in many other areas as well.
Teresa was the name she chose upon becoming a nun. The title 'Mother' was a title given by the Sisters of Loreto to all nuns in the order.
In a open field
Mother Teresa did not go to school. Girls were not allowed to attend school in Albania at the time. She was home schooled by her parents.
From her earliest years she believed in Jesus.
Yes, she started the Missionaries of Charity.
Mother Teresa did not start a company, she founded the Missionaries of Charity who work in a variety of charitable situations including orphanages.
She left the Sisters of Loreto and began working with the poor in 1948. In 1950 her new religious order, the Missionaries of Charity, was approved by Pope Pius XII.
Mother Teresa founded the Missionary Sisters of Charity. Actually, the Missionaries of Charity are not just sisters. The group also has priests, brothers and lay volunteers who are both Catholic and non Catholic.
Mother Teresa started it, now go look up the information yourself