Take a look at this site.

http://www.educationaloptions.com/

I'd do a lot of reading first, and get your son tested by a specialist in the field who can give you advice. All before you approach the schools. A lot of people on here love DYS, too.

We read the entire forum and did a lot of reading and talking to people. It has helped a lot to prepare us for getting the best for our son.