By the end of all CELTA courses, trainees will have learnt similar things, and demonstrated similar skills. However, different course-providers have their own way of enabling their trainees to meet the requirements laid down by Cambridge. If you have questions about how best to prepare yourself for a particular course, and what you need to take with you, the best people to ask are the course providers themelves.
When I was a trainer, i did not expect my trainees to bring along magazines or pictures, though some who had aids that they had successfully used before did bring them, and were glad that they had done so. If you have lesson plans that have worked for you in the past, by all means take them with you, but remember that they may well not be useful for the lessons you will be asked to teach.
If you have no TEFL experience at all, then don't worry. "CELTA is an initial qualification for people with little or no previous teaching experience" ( CELTA). Everything you need will be (a) available in the establishment in which you are being trained, (b) fairly easy to obtain locally and/or on the internet and/or (c) recommended in your pre-course notes.
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