Divorce and Owning a Home

My wife told me 2+ weeks ago that she wants a divorce. She has yet to file and find a mediator, we both agree to be amicable in the process. I am very hurt and not sure why she has made her decision but she is not the "financial" type, that's my role. She asked if I wanted to stay in the house, split the custody with the kids 50/50 and maintain the mortgage. Everything inside of me has told me to stay in the house for the kids sake only, I want them to have some stability during this entire process. I don't want to sell but think it's in my best interest to sell because of the large financial burden that I would be taking on alone. Not to mention the utilities and other essentials that are associated with owning a home. I have asked that she not use any of our co-habitated money for a divorce I don't want. I have also asked that she pay the 6% realtor commission if the house sells. What are my options to (1) stay in the house and ask for help with the mortgage while she maintains another residence (2) does state law have anything about payments to one's account for helping with housing cost (3) what if the house goes on the market and doesn't sell, what can I ask for. We are wanting to mediate all financial and custodial issues without seperate legal counsel but I am very concerned about the "legality" of mediation without attorneys. She said that her legal counsel would hep to "mediate" our case for $1,500 total and would be non-bias in helping us in this situation. If you have any recommendations or suggestions, please let me know. We live in Minnesota, if that helps anyone.