Answers:
Every state is different, but I know in MO you just need 60 college credit hours. I don't know if there is an age limit mentioned, but if it is, I'm sure it would be 18. I know we have had subs that were 19.
age doesn't matter, you have to have a bachelors.
It will very from state to state. I would check with a local school district. In Missouri (I am from the "show me" state as well), you also need an FBI background check, they cost about $50 and take about 2 weeks. Sometimes the school will pay for it if they decide to hire you and you do not already have one.
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