New Jersey Department of Education through its Office of The Office of Recruitment, Preparation, and Certification can help teachers and future teachers apply for certification in the areas of English as a Second Language (ESL) and Bilingual Education. The Office is Recruitment, Preparation and Certification can help guide you through that process. They offer certificates and endorsements.  

Multilingual Paraprofessionals - An Untapped Resource for Supporting American Pluralism
This introductory brief outlines what we know about multilingual paraprofessionals’ abilities, career trajectories, and obstacles to advancement in the U.S. education system.

State Approved ESL or Bilingual Programs for Certification