It sounds like your son will do well because you are a good mom. I turned out okay (well, we'll see--I am only 23) and I wasn't diagnosed until fifth grade. From what my mom tells me, it would have been a lot easier on her and I if she and my dad had known sooner that I have Asperger's. Instead, they had to wait until I just started to fall apart in school before a professional diagnosis was deemed neccesary.
My advice would be to give your son intense lessons on social skills. Many kids with AS are highly intellectual and, I think, can learn social skills that come naturally to others. It is a challenge though. Also, kindle his passions (only the productive ones) and direct him to utilize his talents as he gets older. Most of all, just be there to support him through the rough times. Honestly, I shudder to think about what would have happened to me if I did not have exceptionally excellent parents. Your son is fortunate because you sound like an excellent mother.
From my experience, there will be rough times. Your son may have fits of rage occasionally. Find a way to let him physically vent his rage, if this happens. I needed that and my dad would wrestle with me, which helped me get my anger out. If he is not in a special education school, I would expect him to be bullied pretty badly. I was. It isn't fun but I didn't seem to mind that I was hated by so many other kids because I had very little interest socializing with any kid other than my one and only friend. Maybe your son will feel the same way.
So yeah, there's a few things. I'm not a mom, I know, but I thought I could give you some insight. If you want more I would be happy to give it to you. Just ask.