Hello,
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Here I will be providing you the list of the best course for business education and ELIGIBILITY for being a teacher.
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List of courses,

• Accounting
• Business administration
• Global business
• Health care management
• Economics
• Finance
• marketing

Doing MS/BA or MBA in any of the course will give you the best Career.
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If you hold even a degree you are eligible to be a teacher but Holding MBA or related studies gives you a bright future.
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Eligibility to be a business teacher,

• Must hold a bachelor's degree
• Higher universities may ask for MBA or related studies mentioned
• Complete teaching internship
• Pass the state's required test
• Apply for teaching license

Note: Being a teacher eligibility differs from state to state and the above mentioned are minimum qualification you should have.