Autism spectrum usually means higher-functioning (like myself) and I highly suggest checking out these two books:
The Complete Guide to Asperger Syndrome by Tony Attwood
The Oasis Guide to Asperger Syndrome by ...
Both are fantastic. Also, Lianne Holliday Willey, both a parent and person living with ASD, edited a book for adolescents. While (even though this post is old) your child is quite young, there is more great info, plus lists of practical ways of dealing with sensory and sensory-motor issues. I'm a bit older (nineteen) and it's my favorite.