It depends largely on where you are looking to teach. In some states, Bachelor of Arts in English Education and a state exam are all that are needed. In others, a Masters' degree is required.
Almost all states have a test of some kind.
Check the site below, as it lists links to the certification page for every state education department. You can find information for your specific situation.
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Explain to the student what he/she will have to accomplish regarding school and what they will be learning. If the student truly loves English and working with others, then maybe have the student "shadow" another English teacher. Sometimes, I think shadowing is the best as it can really expose the student for what he might be doing in the future.