Read this:

The traditional route to becoming a public school teacher involves completing a bachelor’s degree from a teacher education program and then obtaining a license. However, most States now offer alternative routes to licensure for those who have a college degree in other fields. Private school teachers do not have to be licensed but still need a bachelor’s degree. A bachelor’s degree may not be needed by preschool teachers and vocational education teachers, who need experience in their field rather than a specific degree.

You’ll need a BS in Education or whatever grade/subject you want to teach.
That’s a 4-year degree.

Contact your State Department of Education:

Pros:
You’ll never be bored.
You get to see children improve at something.
You can make your job better by how much you put into it.
You have creative control over how you teach.
You get summers off.
You get 2 weeks off at Christmas.
You get 1 week off in the Spring.
You’ll get insurance and salary enough to live on your own.
You will learn how to be an adult.
You will learn how to set boundaries and take care of yourself.

Cons:
It’s VERY demanding emotionally, and mentally.
Depending on the age you teach, kids will eat you alive if you don’t know how to handle yourself.
You’ll need to spend some of your own money for supplies.
You won’t earn enough to buy a home unless you marry someone who also has a full-time, good-paying job.
Unlike many of your friends who work in offices, you barely have enough time to pee, or make a phone call.