Advice Please

Hi. I am new to this website and I hoped someone may be able to share some advice if possible please. My 6 year old son recently has been diagnosed with ASD, he can communicate very well verbally however all other forms of ASD are present both in school and home life. 

His behaviour can be very challenging and I am looking for some advice on the best way to manage this so all of our focus is not solely on him, so the other 2 children are not overlooked. Whilst it is not his fault and we fully support him 100%, I am trying to get a bit ore balance in the family so everyone is ultimately happy!

He also goes to quite a large city primary school which he has never enjoyed and constantly there are issues most days! Now there is formal diagnoses for ASD we hope the school will have the funding for suitable support in class as currently he is 2 + years behind his peers, so we are worried that unless a suitable action plan is in place soon he is going to struggle even further.

I am also writing to see if you think changing his school to a smaller setting would help him and if there are more suitable schools in our area, but I also am reluctant to change schools if we still have similar issues elsewhere.

We just want to do the best for him as I am sure everyone on here feels the same.

I hope someone can share there experiences / knowledge 

Many Thanks