What we agreed upon was who would pay for what bills, my XW works but would not have been able to afford to move out if she did not receive any money from me. Either I pay and she moves out or I don't pay and she stayed in the house and we did in house separation. At the time it was worth me paying for things to get her out of the house, it helped me detach quicker and I knew that I would end up giving her support any way if we were divorced so essentially we were living like we were divorced.
We had to agree on Custody, debt, 401k split, cars, other retirement savings, who would claim what kid on taxes, savings, life insurance and their college savings.
You should worry about the financials it sets a precedence.
Lastly, my XW never waivered from what we agreed to when she moved. She was nice, accommodating and did not put up a fight...….all she wanted was OUT. As soon as she moved out she immediately started dating and exploring the single life. Just prepare yourself, once they are out of the house or you are out of the house the game changes!
