The easiest way to determine marital debt is to get a copy of your credit report. You need documentation showing your income and the income of your spouse.
It is a good idea to make copies of such statements before filing for divorce.
You may be able to get an idea of how much your spouse actually makes but, it can be almost impossible to determine true income when a spouse is self-employed.
Its best you be prepared by building a budget now instead of being hit over the head with bills you can’t pay.
You will have to estimate some expenses but it is important so that you can have some idea of what you will need to survive in your new life.
It is clear that the marital home, any financial accounts and vehicles are assets that should be split equitably.