It seems like you have the right idea of how to deal with him.
You are right, it's not a disability. The most important thing to consider, is getting him ready for the world outside. His interaction with society will never be as normal and easy as with the majority of people, but with proper training, and education, he can act like it is. People with autism lack empathy, and don't understand human emotions properly. It confuses them, and can put them in awkward positions as they rack their brain trying to guess what a non-autistic person would have done in similar circumstances. And this is the part to be focused on. Teaching them standard social behaviour. Autistic people love rules, love routine, and teaching them proper responses to common questions, proper behaviour to common incidents, will certainly make them much happier in life. If they dont know how to respond to something, they'll try and remember taught rules, then try to remember past experiences, maybe something they've seen in a movie, or read from a story, or happened with another family member.
For example, if one day, your son got married, and his wife bought him a bouquet of flowers. You shouldn't expect him to be as delighted as most men would be. But with proper training, he'll understand the gesture, he'll understand what she means by them, and will display the delight she's expecting, even though in reality, he really doesn't care about flowers at all. Eventually, he'll be capable of understanding most social interactions, understand expected responses, and cope with society, hiding his syndrome from everyone except those close to him.
All it takes is the basic understanding of what he has, and what *others* are like, and why he should try and cope.
Hope this helps you.