I stumbled upon the “Parenting Plan Handbook” today from the San Diego Superior Court. I strongly encourage separating parents to take a look, particularly parents with small children.
It’s very introductory and would not be very helpful for a drawn-out, acrimonious, legal battle — but it is a clear, concise resource for defining (in ‘layman’s’ terms) legal terms and offers a lot of practical options for developing a parenting plan.