I know you know this already...but document everything. Take photos of the inside of your home so that you are aware of what is being moved out on Saturday. Also, make sure that you can very good records of what you give in the way of funds. There is no reason that this man can't work a better paying job and unless I am missing something, you shouldn't be paying him spousal support.
Have someone at the house on Saturday just in case he becomes ever more of a monster. If someone is there, he might not act like a mule around you or the kids.
I am sorry it has come to this....but it's been a long time coming and hopefully you will find some peace and be able to make the space far better for children and you.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
