Welcome! Glad you are here. There are lots of other parents here who have kids with various special needs. In case you haven't yet seen the thread where some of these parents have introduced themselves and their little ones, here is the link:
http://forum.brillkids.com/parents-with-special-needs-children/please-introduce-yourself!/
My guess is that you are not starting too late.
It is never too late to start this wonderful journey of teaching our kids! Have you downloaded the free trial of LR? That might be a good place to start. You could then see if your little man is interested in it or not.
Keep browsing through the forum; there is a lot of good information to glean here! And never be afraid to ask a question!!! Lots of wonderful, helpful people here!
Keep us posted on how things are going!