Consult the Department of Labor's Occupational Outlook Handbook to decide exactly what type of speech pathology job you want, then enroll in appropriate schooling.
Find a speech pathologist in your area and introduce yourself by email saying your interested in their profession. Ask them how they got their job and to see their resume.
You will need to major in Speech at a university that offers a bachelors degree in speech. Many persons major in communications and then get their masters in speech.
