I really can't tell you much as I'm not a parent, but getting support for him as soon as you can is a good move. That being said, try not to let it rule his life. I had no therapies and wasn't dx'd until later in life, and although I definitely wish I would have had OT or something, and wish I was eligible for it now, I am glad that my life wasn't one appointment after another.
You might want to check out Spectrumites
http://www.spectrumites.com/forums/index.php It's a forum primarily for people on the spectrum, but it's also got NT parents with autistic kids, autistic parents with autistic kids, autistic parents with NT kids, etc etc so I'm sure someone there could give you some tips, or at least be there for you to talk to. It's not very active at the moment, but it's getting there again. It's probably one of the most balanced and accepting autie forums out there - we accept that it is disabling for many if not most people, but t has its ups too -empowerment and support are key over there. I'm a mod and I go by Eponine there.