Start with high-confidence parenting special needs books, then narrow by subgenre or adjacent topics.
Raising a Sensory Smart Child
Lindsey Biel, Nancy Peske
Disconnected Kids
Dr. Robert Melillo, Robert Melillo
Beautiful Boy (tie-in)
David Sheff
Autism and Girls
Tony Attwood, Temple Grandin
Finding Zoe
Brandi Rarus, Gail Harris