4 year old has autism, what can we expect?

Prognosis depends : on degree of Autistic Spectrum Disorder, level of cognition & early response to treatment. Treatment is intensive, repetitive, ongoing educational & behavioral therapy geared at your child's developmental age. Yout resource is on http://here.doh.wa.gov/materials/autism-guidebook/13_AutismGd_E10L.pdf. Take care of yourself. It's a marathon, not a sprint. No parent can do this alone.