Hi Vina!
Welcome! It is definately
not too late for your little boy. We are glad you have found this forum. There are lots of good resources.
I would suggest reading some of the basics at
www.brillbaby.com.
I also found the following thread to be helpful when I started:
http://forum.brillkids.com/general-discussion-b5/gentle-revolution-and-glenn-doman's-method/Glad you are here, and look forward to hearing from you.