I took a teacher training course with the British Wheel of Yoga in the mid 90s. You will learn a great deal and cover lots of topics that might not appeal - I hated using the neti pot but we had to experience it! Perhaps if I had sinus trouble I would have welcomed it but I only did what I had to do.
The meditation I loved to the extent that I went on to deepen the practise by going to a Buddhist nun and I still spend more time in meditation than asanas to this day.
Safety has to be your main concern and for that reason I do not give any instruction on neck rolls or double leg lifting/lowering. I have found that only very fit people can do them and most of the people that inquire about yoga are overweight and unfit. You first “classes” will be your fellow students, therefore they will likely all be flexible and know how to breathe. When you get out into the real world, they tend to expect that a lesson or two will have them athletic and skinny.
To pass the course you need to develop skills in lesson planning and time management. Plus how to recognise progress in your students - it is not enough to be able to demonstrate the asanas perfectly.
A “good” lesson will include a suitable (always bear in mind the age, condition and obvious health issues of your students) warm up, forward and back bends, rotations, a balance and an inversion. Then you need a bit of philosophy such as a reading from the Gita, also some pranayama and a relaxation.
Finally, if anyone asks for medical advice please do not give it! Always refer them to a doctor,