What type of education does a travel agent need?

What type of education do you need to be a travel agent? Where can you study the program (like what type of schools/where, etc.)? Do you get a certificate, degree, diploma? Are there any publications that might have job openings available in this field, or do you have to open your own business? (I never really see advertised travel agency job openings.) I have already graduated college but am considering a career change. This is something I'm curious about, so any info would be helpful.
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