I know that this is Down's but I MUST TELL YOU --as a person who has worked in the school system with children who have different needs that most thrive on routine, and having worked with a child who is autistic....I would NEVER DO IT AGAIN. Even though this is my area of training.
Here's why the parents ran the show...I had to change so much about my program, and they were not willing to face the fact that he had differing needs or for that matter pay for it.
Be prepared to toliet this child if needed, perhaps guiding them in every task....Moodiness and uncooperation. I don't mean to take the wind outta you sails, but children with Down's are sometimes hard, and I am trying to let you know the posibilities.
SPELL OUT your policies, ensure that your contract is air tight and make it clear that this is your dayhome.
I would charge at least time and a half for this so for example if you are charging 45, I would charge 60/day