The answer depends upon what state you live in.
Generally:
1. Obtain a bachelors degree from an accredited college. The major doesnt really matter. Some law schools prefer non pre-law/CJ majors to add some diversity.
GPA, activities, and leadership roles are important.
2. Take LSAT. The higher your grade, the better the chance of acceaptance to law school as well as better chance for a scholorship
3. Obtain a JD from an accredited law school.
4. Apply for the state bar exam. (A few states only require that you graduate from a law school in their state, no bar exam necessary.) The application process generally entails, fees, criminal background check, drivers license check, credit check, reference check, etc.
5. Pass bar exam.
6. Apply for admission to the states bar (may need a sponsor)
7. To start/continue practicing, you may need to take exams (as in NJ) or Continuing Legal Education credits (as in PA), pay annual fees, and do pro bono work.
I'm licensed in NJ and PA and used to be a volunteer in my law schools admission and recruitment dept.