You will need to do a bit of research to ensure you get the best postgraduate teacher training possible. Start by researching the specific requirements for teacher training in your area, as the requirements can change by region. Then, research different educational institutions that offer postgraduate teacher training coursework; make sure to consider reputable schools that are accredited, and avoid educational institutions that lack accreditation. It may help to consult with your undergraduate institution for recommendations on good programs that you might qualify for. An academic advisor or career counseling center is a good place to start your research.
Make sure you understand your career goals and your reasons for seeking out postgraduate teacher training coursework. Some school districts will require you to work toward an advanced degree, but other teaching situations do not necessarily require a postgraduate degree, so be sure you know and understand the requirements. Choose a postgraduate teacher training program that will give you the qualifications necessary to obtain the job you are looking for; this may mean taking subject-specific coursework or broader coursework that focuses on methods of teaching in general. Research each program to find out what the coursework will prepare you for.
If you will be working full- or part-time while taking postgraduate teacher training coursework, you may want to consider taking online classes. These classes allow you to study from home or the office, and you can fit coursework around your schedule in most cases. Many online classes allow you to work asynchronously, which essentially means you can work on class assignments at your own pace at any time of day, as long as the assignments get submitted on time. This option is useful for people with complex schedules or for people who cannot feasibly travel to an on-site classroom regularly to attend classes in person.
Be sure to consider your budget before enrolling in postgraduate teacher training. Some programs are more expensive than others, and the cost does not always directly correlate to the quality of the program. Research each program carefully, and if possible, ask questions to people who may have completed the program in the past or who are currently enrolled in the program. Make a determination about which program will fit your learning style best, then consider the cost of the program and look into financial aid options. Remember that each program will have different admissions requirements, so make sure you will be able to meet those requirements before applying.