To become an ESL teacher, one must obtain a bachelor's degree, earn an ESL certificate from an accredited institution, and, if necessary, acquire a teaching license before applying for positions. The document emphasizes the importance of choosing appropriate TEFL courses, whether online or in-class, while also outlining steps to achieve certification and the necessary skills required for effective ESL teaching. It highlights the vast demand for ESL teachers, with 1.5 billion English learners worldwide.