Finding a job or internship

Most universities have a department of Desarrollo e Inserción Laboral (development and job placement) that gives guidance to its graduates in finding employment. They often sponsor courses, workshops, conferences, seminars, and job fairs.
Another useful department is the Oficinas de la Bolsa de Trabajo.
For the University of Guadalajara, for example: http://mcurie.uag.mx/vinc/bolsatrab/
To learn all about the conditions for working in Mexico, consult www.naal.org/spanish/publications/ispwna10.htm