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Depending on what type of coach you would like to become will vary on the lenghth and type of education you need. Many people interested in becoming coaches start as volunteers coaching a youth team to get their first experience.
Each sport has their own set of requirements for education and classes needed as well as time spent apprenticing before actually be chosen as a coach for a team.
This link will give you a little more insight into the educational requirements and what you may have to do to become a coach: http://www.bls.gov/k12/sports03.htm