Come up with a monetization strategy before just jumping in. A quick search shows 250k+ combined exact monthly searches for the main few aspergers keywords, so there are searches, but where's the money?
Before you go creating a site to pitch some Amazon books or create your own ebook, think about that aspect. The competition is high so you should probably find a more profitable product/service if you want to survive. Adsense certainly isn't the answer here.
Do you know anyone with any form of Autism? See what it's like in real life and think about how you could help. You can try the "prey on parents who will do anything for their child" trick, but also realize that a child with Autism brings a lot of extra expenses, so your product better be worthwhile if you want it to make the cut.