It's great that you want to help your child learn more appropriate behaviors and responses in social situations.  The best place to turn for teaching him those behaviors really depends on what city and state you live in.  A great online resource is the US Autism and Asperger's Syndrome Association.  Their website is www.usautism.org.  From that website, click on Library and you will find several links to organizations that may be able to help you find local referrals for treatment.  It would be a good idea to make an appointment with a local child psychologist to help you assess ways to best accomplish behavior modification with your child.  Again, check out those sites!!
 
Take Care,
Boys Town National Hotline
1-800-448-3000