My 3 yr old boy was diagnosed with autism not to long ago. He just started school the 13th of Aug. He loves it, I applied for DDD and they called me 2 days ago to let me know he was not approved by ALTCS. Can anyway give me advice on another service I can try here in Tucson AZ to help him, and also things I can do at home to benifit him.

Chances are your school will give you lots of great tips on what to do.  My son had ABA therapy at 18 months at a school, but they also came to the house once a week.  During that home visit my husband and I watched and learned what to do to really help him.  See if you can get anything like that.