It depends where and who they want to teach for.
Privatly, they could have just done a product course and off you go.....
Product company, may require some experience, and to have trained with their products.....
College, may want you to have an official qualification, such as the NVQ units, also a teaching qualification such as the 7306 / 7407.
I would aslo check out insurance, make sure that the tutor and students are covered, good luck!