You need to be licensed in order to practice. Licensure happens on a state-to-state basis.
Not all chiropractic programs require you to have a bachelor's degree. The programs that don't, specify that you need to take the required college-level course work and complete at least two to three years of college. However, most schools prefer applicants with a bachelor's degree. And many states will not license a chiropractor without one.
You need to be able to work well with your hands since spinal manipulation methods are a large part of this program.
Some chiropractors open their own practices. Because of this, you may want to take business and accounting courses in college.