Hi. My sister is tutors english to primary school to high school students. She intends to expand her business in the following way, she wants to get into the business of selling her teaching materials online, in pdf format (she doesn't have any material to sell yet.). Initially, we will be selling the material individually, later via subscription when there more material to sell. She will continue her face to face/online lessons and I will be responsible for running the website.
How would I go about doing this?