Talk About Curing Autism, the group that Jenny McCarthy represents, has a get started guide that my husband and I wish had existed when we started out on this journey three years ago. It covers all the bases.
It is a great one stop for what you need to know to get your child the help they need. If you are the friend or family member of someone with a child with autism, get one for them and one for yourself. They will need lots of help in the journey, and you can't claim that you really love them if you don't shoulder their burden.