The Practicum is a very important module for trainees with little or no prior teaching experience, but it comes after the TESOL course for a very good reason: You cannot stand in front of a classroom if you do not know what to do at each stage of the lesson.
During Methodology, the trainee learns about different methods for effective teaching and the structure for delivering a professional lesson. A plan is crucial as each stage of a lesson requires the use of different tools and activities depending on the type of lesson, aims, assumptions, and anticipated problems and solutions.
Once you know how to create a professional lesson plan, you can stand in front of a classroom with confidence. In general, the Practicum is not required for an entry-level position, so deciding to complete the Practicum depends on your desire to obtain supervised teaching experience as well as the requirements for jobs and accreditation.