The content of the course depends on the flag of your organization. Generally, there are bilingualism, right brain development, sensory training, Montessori-like whole brain development, Orff music and so on. And there are many new styles. You should know more about how to take classes.
Some institutions provide early education for 0 to 3 years old, accompanied by parents, and attend classes by themselves at 3 to 6 years old. There are usually about six students in a class. At first, I may be a teaching assistant, responsible for discipline, preparing teaching AIDS, filling out forms and making appointments, playing music, etc. And the salary is not high. There is usually a basic salary plus a commission for formal courses. The commission is calculated according to the number of classes you attend or the number of children you bring. I don't know where you are, so it's hard to say. Unless your schedule is full, it should also be the average income level of graduates. If you are in the market, there is a big gap between good and bad performance.