Autism tends to love routines. Keeping to a schedule throughout the day can help you and your child manage your expectations of each other. The stability of a routine is especially helpful for people who easily feel overwhelmed by new things.
However, this can be a double-edged sword. A too-rigid routine can set yourself up for problems if you need to change something for a day. Have a routine, but keep it flexible. Talk with your child about what will happen today and tomorrow, and let them know when things will be different from yesterday. In addition to talking about your routine with your child, take some time alone to think about it for yourself. Before your child is prepared for a routine, make sure you're prepared first.