Since this is a new school, I agree that the first thing I would do is get the lines of communication open and listen, listen, listen. Take a lot of notes. Find out how they plan to handle your child and the timeline and what it all means. Find out the best time/way to contact the teacher. Find out when the pullout for math/reading will start and how it works. Ask who the pullout teacher is and an email address if possible. Ask if the teacher does cluster grouping for reading and math, i.e. try to gather general information that will help you understand what is possible.
What I didn't get from your post is whether the pullout program doesn't start for 20 days of school, or whether your child isn't going to the program for some reason but it is currently happening. If the former, so be it (a good topic to advocate for later on in life), but if it is the latter, I would find out specifically why and ask to have him start immediately. If the latter, once again, find out who the decision makers are and go directly to them.
Good luck and keep us posted. I know it is so challenging to deal with all of this,but it will be worth it for your son.
