Post-secondary requirements for becoming a teacher vary by state, but typically include earning a Bachelors degree and then a Masters degree in Education (or similar specialization which depends on your focus -- ex. Art, Music, Special Ed, Speech, etc.). Also, depending upon the state requirements, you may be able to start teaching while earning your Masters degree.
There's currently a teacher shortage in parts of the country, so some school districts are hiring people with lesser qualifications. Part of the reason for the teacher shortage is that teaching is a demanding job that does not usually pay in line with the advanced degrees required for the role. The work requires commitment, tolerance and patience, but can be very rewarding if you get into the field for the right reasons. If you're looking to make a lot of money, you're definitely in the wrong field.
Todd recommends the following next steps:
It does depend on where you are planning to teach. It also matters if you want to work in public or private education for K-12. Some areas will even let you teach even if you have not graduated in your post secondary program.
I would offer that you should do a degree in Education for your sake as much as the opportunity to get a job. Why? In college, you will have the opportunity to practice being a teacher. Many teachers I know who went to college also did internships where they had school and peer support as they started teaching. Teaching looks easy, however, some of your biggest challenges are not just around conveying information. It can be challenge to do things like managing a classroom of 30 people or how to create your training plans.
It is always good to check job postings in the school district where you want to work to determine education requirements. Remember, the city and county you live in may have different requirements than another city or county, even in the same state.
I am excited that you are considering teaching. Having a passion for teaching goes a long way to getting you through the hard work it takes to earn a college degree.