This document will help you layout the history of your marriage and how you got to a point of divorce. This will come in handy as you start meeting with lawyers. 

Once you are on your own, you need to ensure that your finances are in order. Use this spreadsheet as a way to help you get started. 

Assessing the degree of each parent's current involvement in their children's lives can be taken into consideration while determining custody. You can access this workbook of questions to assist you in clearly identifying the level of involvement for each parent.