Have they said what they are hoping to achieve with the PSP? Will it involve outside agencies?
There is a thread here -sorry I can't do link - Pastoral Support Plan - What is it? on 12-Jul-10 which you might be interested in.
Are you happy with it? I was told by Parent Partnership that it was usually used to show that everything was done before school starts excluding but this is probably not true in your case as it is a new school. Look at SEN COP 5.52 and 6.60
In theory, the PSP is both for the staff and your ds. It is 'for your ds' in that the strategies should utlimately be of benefit to him but it is 'for the adults' in that it is provideing the structure and informationon what to do when.
There are usually fortnightly meetings, 8 of them, and usually 2 to 3 targets very tightly written. You might want to make sure you agree with the targets. The person in charge will decide what constitues success eg meeting the targets 3 out of 5 times etc. and then they add other targets etc.
Of the fortnightly meetings, the 4th and the 8th are considered the most important and if your PSP involve external agencies like EP etc., then these are the ones they should attend.
In my experience the good thing about the PSP was that it enabled me to really talk to my ds's teacher and TAs fortnightly (and know what they were doing). What was extremely important in our case was that the OT assessed ds before the start and made a lot of recommendations which helped him deal with his sensory overload and his aggressive behaviour. In fact, by the 1st review, Target 1 re: aggression was achieved because school learned to recognise the signs of sensory overload.
Sorry for the essay. HTH