However, if you're absolutely sure you want to be a teacher, then, as Czarina said in her answer, you can find a school that will help you get certified to teach in almost every state. It's also just a good idea to learn from experts how to teach effectively and to get first-hand experience in the classroom by doing field work in schools. Also, to advance as a teacher, most schools require that you get an advanced degree; either a masters degree or a doctorate (EdD). But, you don't have to worry about that at this point. We need good teachers, so I encourage you to explore this interest further. Best of luck!!
If you are a graduate student, you can also find colleges / universities that offer teaching programs and the process is similar. I went to a graduate program for my teaching degree and my university not only gave me a list of classes, but also a schedule of when I will take each of them. Some teaching programs automatically enroll you in the classes each semester or quarter. In my specific program, I took classes on the pedagogy of every subject, special education law, disabilities, and urban education, just to give you an example.
Regardless of the path you take, you can always schedule a meeting with a program advisor to help make sure that you are taking the necessary classes you need for the path you want to take. Good luck!
I started as an elementary school teacher; then I taught reading to secondary school students. I have also taught undergrad and graduate students. For most of my career I have taught adults who have jobs, at their place of employment. This is called corporate training.
Being a teacher is wonderfully rewarding and there are many opportunities to use those skills, in and out of elementary school.