Regarding your house, are you thinking you may have income from the discharge of debt? or are you wondering about mortgage interest and property tax deductions?
If your filing status is Married Separate, you do need your husbands social security number. You also need to itemize deductions if he itemizes. Depending on whether you have children that live with you and how long he has lived out of the home, you might be able to file Head of Household.
If he has not lived there, and you have provided more than half of the household support, then you can file Head of Household. You will not need any of his information.
You can take deductions for mortgage interest and taxes that you have paid. Of course, you are not required to itemize your deductions, you may choose to take the standard deduction if it turns out to be higher.
Thank you for your question. Please Reply if you need additional help.