3 days after my 13 year old son has been diagnosed

I'd give him some time to let it sink in and as suggested get some books about ASD, there are books out there written by people on the spectrum themselves(or relatives of them) which personally I think are better reading then a professionals clinical view of things. Particularly because he's so young, you may want to find something more age appropriate that he can read himself without possibly being confused by certain terms or 'large words'.

Just from a quick search on amazon I found these;

http://www.amazon.co.uk/Can-Tell-About-Asperger-Syndrome/dp/1843102064/ref=sr_1_4?s=books&ie=UTF8&qid=1343826837&sr=1-4

http://www.amazon.co.uk/All-Cats-Have-Aspergers-Syndrome/dp/1843104814/ref=sr_1_5?s=books&ie=UTF8&qid=1343826837&sr=1-5

http://www.amazon.co.uk/Special-Book-About-Diagnosed-Diagnosis/dp/1843106558/ref=sr_1_5?s=books&ie=UTF8&qid=1343827103&sr=1-5

http://www.amazon.co.uk/Blue-Bottle-Mystery-Adventure-Adventures/dp/1853029785/ref=pd_cp_b_0

http://www.amazon.co.uk/Mice-Aliens-Asperger-Adventure-Adventures/dp/184310007X/ref=sr_1_6?s=books&ie=UTF8&qid=1343827156&sr=1-6

Also this documentary I saw on newsround a few months back was quite good at explaining things for a younger audience;

http://www.youtube.com/watch?v=ejpWWP1HNGQ

I'd give him some time to let it sink in and as suggested get some books about ASD, there are books out there written by people on the spectrum themselves(or relatives of them) which personally I think are better reading then a professionals clinical view of things. Particularly because he's so young, you may want to find something more age appropriate that he can read himself without possibly being confused by certain terms or 'large words'.

Just from a quick search on amazon I found these;

http://www.amazon.co.uk/Can-Tell-About-Asperger-Syndrome/dp/1843102064/ref=sr_1_4?s=books&ie=UTF8&qid=1343826837&sr=1-4

http://www.amazon.co.uk/All-Cats-Have-Aspergers-Syndrome/dp/1843104814/ref=sr_1_5?s=books&ie=UTF8&qid=1343826837&sr=1-5

http://www.amazon.co.uk/Special-Book-About-Diagnosed-Diagnosis/dp/1843106558/ref=sr_1_5?s=books&ie=UTF8&qid=1343827103&sr=1-5

http://www.amazon.co.uk/Blue-Bottle-Mystery-Adventure-Adventures/dp/1853029785/ref=pd_cp_b_0

http://www.amazon.co.uk/Mice-Aliens-Asperger-Adventure-Adventures/dp/184310007X/ref=sr_1_6?s=books&ie=UTF8&qid=1343827156&sr=1-6

Also this documentary I saw on newsround a few months back was quite good at explaining things for a younger audience;

http://www.youtube.com/watch?v=ejpWWP1HNGQ