How can I become a teacher in USA?

Hi guys! I need your help. I have a green card and I am a special education teacher in Turkey. I want to come to America but I have some concerns. Can I do my own business in America? Also, what are the safe situations? I heard there is a huge demand for teachers in California. How can I become a special education teacher or specialist in the USA? I don't know if my salary will be enough for me. I will be very happy if you answer.

How can I become a teacher in USA?
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