ah I feel your worry and upset over it all. stbexh and I did this in November last yr to 6 & 8 yr olds. good to have DVD to distract and bring some normality.
over coming weeks as things change DC may ask lots of questions and be sad about things like holidays and birthdays etc. be honest and reassuring about everything. lots of cuddles and some plans for you to do things together.
we took dds to their dad's new house together to look around and were very mindful of their feelings in not rushing them to stay over so if you can completely go with what your DC wants to do.
youngest of my DDS lots of tears and questions really up til Christmas but then after that doesn't really mention it. seem to have accepted that's how it is.
good luck. things do get better, I've found, so far anyway, my DDS have dealt with it much more smoothly and acceptingly than I have
He's been fine, has asked a few questions about where we'll live, if he'll have to change schools, etc. but no more tears. I suppose when things start to happen (selling house, H moving out) he might have rocky times, but he's a good kid, and has excellent support from my family.
That's great news, I was wondering how you were. It amazes me how easily they seem to accept change - it's far harder for us adults isn't it?!
My advice is just to be very open, keep talking and answering questions, but try not to be negative in any way about your ex. He'll always be his father and despite what you and he have been through just try to keep a brave smile on when talking to your ds about him.
This is what's working for us and while I'd prefer not to see or speak to my ex I do, for the dcs sake and I think they appreciate it.