Blecky. Its all just blecky. And I totally understand the fear of the unknown, the fear of the future. Totally understand it. Heck, the whole divorce process is terrifying, as no one has been through it yet. Make sense?
I know whatever response you come up with will trump mine, but I would just respond (when you are ready) thanking him for the kind approach, and yes, you want to remain at peace while figuring things out. Maybe set a date (a week?) and meet somewhere neutral, each with list in hand, of ideas.
OR...
Find a mediator and go in with nothing. Start from scratch with the mediator. That's what they are there for anyway.
