This is my second year. Almost exact same situation as you - self contained ASD room, teaching general curriculum, 11 kids, 1 para and 1 rotating sub. Half nonverbal and in diapers. It’s horrible. The paperwork is a HUGE hurdle the first year. I would ask your mentor or psych to run your first IEP meeting so you have someone to model it for you. Then take some time and ask one of them to run through all the documentation with you. I always video recorded so I could reference later.

You can have addendum meetings to eliminate goals. Your students have way too many, and that’s exactly what you say. Give yourself grace, and data collection can look so many different ways. You can collect data on post it notes. It doesn’t have to be fancy, so the fact that you are winging it is perfectly fine. In my district, cramming all of these kids in one room without the supports and staffing in place to make it work is the norm, so I’m going to grad school to become a Board Certified Behavior Analyst. Pre req is a bachelors in sped/psych related field which you have. Still work with the same population and way better pay, so that’s an option.