I highly recommend the book Helping Your Kids Cope With Divorce the Sandcastle's Way (Neuman). It is truly an invaluable resource, and will help you to do everything in ways that are easiest and healthiest for the kids and for you two.
In addition, there are some good kids' books out there about divorce that you might want to read to the kids. I also really focused on talking to mine about how all families are different, identified ways in which they are different, talked about how some change. We read books about families with one parent, grandparents, disabilities, different colors, all kinds of diversity. We talked about how sometimes families can even change from one kind of family to another, but that one thing never changes—the parents always, always, always love their kids. It really helped to lay a good groundwork of understanding and help them feel less alone.
Some books for kids about divorce... (Dinosaurs, Koko, and Mama and Daddy Bear were the best that I've read, but I haven't read all listed):
It's Not Your Fault, Koko Bear (Lasnky)
Dinosaurs Divorce (Brown)
Two Homes (Masurel)
I Don't Want to Talk About It (Ransom)
Was It the Chocolate Pudding?: A Story For Little Kids About Divorce (Levins)
Mama and Daddy Bear's Divorce (Spelman)
My Family's Changing (Thomas)
What Can I Do?: A Book for Children of Divorce (Lowry)