pediatric assessment. what next?!

Hiya 

We had an assessment done for my 7 year old son yesterday with a pediatrician, pediatrician has confirmed aspergers and selective mutism. What happens now? Is this the formal diagnosis or will we have to go for more appointments? Will I receive something in the post confirming his findings etc. Sorry, he wasn't very clear on what happens next and never said whether this assessment would be the only one, or just the start.

Any advice/help would be greatly appreciated. Feeling extremely confused right now!