Participate in research as an undergraduate. Take research coursework, become involved with faculty research, get to know graduate students.
Join appropriate professional organizations and attend conferences as a student.
Get a teaching license /certification for desired subject area and/or grade level for public school positions (Note: requirements vary by state; private schools may not require licensing / certification).
Obtain a master's degree in subject area for increased employability.
A master's degree or Ph.D. is required to teach at two-year higher education institutions; a Ph.D. is generally required to teach and do research at four-year institutions.
Obtain a master's degree in student development, or counseling for student affairs or administrative positions.