The U.S. Department of Education has a transition guide that covers different post-secondary education options for people with disabilities, as well as educational rights, transition services, and employment after education.
Autistic Inclusive Meets (AIM) is a nonprofit organization hoping to increase community involvement for autistic people of all ages. It also has a guide focused on supports and specific tips for autistic university students.
The College Autism Network's mission is to improve the experiences of autistic post-secondary students through working with educators, family members, researchers, and autistic individuals themselves. Their Autism Specific College Support Program database can help you find institutions that have support programs for autistic people that best fit your needs.
U.S. Department of Education
Autistic Inclusive Meets
College Autism Network