In any metropolitian area, there are schools/programs designed just for autistic kids. I know of about 3 private schools, and 3 public school class programs just for autistic kids in my area that I know about (which admittedly is one of the largest metropolitan areas in the country), with allegedly a charter school on the way (doesn't seem like it will make it though). If I could find a way to afford to live in the Bay Area of California, there would be no end to the amount of programs there. You would be amazed at how undiverse some programs are, especially when it comes to autism which has so many different types of challenges not generally seen in special education as academically the type of students I want to teach are just fine, but place them in that setting and problems quickly arise, trust me. I am not planning this blind, I know that the jobs are out there, and I am willing to travel just about anywhere to find and land them.
This all is pretty much my first teaching experience, and therefore also first lesson writing experience. I did frequently ask to see my co-workers lesson plans in the first placement with no success (she said she didn't want me to copy), and my lesson plans in the second placement were just fine, and granted much easier to write (it helps so much when students are at similar cognitive levels).