Before overnights begin, this will be for naps. Keep naps at approximately the same time at both homes. If you are the visiting parent, don't introduce major parenting changes during your time with your toddler. For example, don't start toilet training your child if your former spouse has not begun this process. Don't expect the other parent to do things exactly as you.
Close enough is good enough.
Create a way that you, as parents, can discuss your children in a constructive manner. Some ways that have worked for other parents are a weekly phone call at a scheduled time, meeting at a restaurant every other week, or a monthly meeting with a mediator. In between talk times, you can exchange notes, but do not depend on notes to discuss major issues concerning your toddler or other children. If your toddler is in day care, let the day-care personnel know there has been a change in the family. This will help them understand changes in behavior.