Two options are litigate or ignore him. If you litigate it will cost you legal fees, uncertain if you win, uncertain of amount awarded and ability to collect. You can also seek an order of protection if he is harassing you.
Review your situation with your attorney. Make sure that you complete the statement of net worth and include tax returns and pay stubs. If the income differs by a few thousand, then the new formula should not trigger spousal maintenance being granted.
Contact a local personal injury lawyer to represent you if you have been injured. If you are not injured, then your insurance company will provide an attorney to defend you. If you are just seeking damages to your vehicle, then consult with a local attorney. At depositions they have a lot of latitude. They will want to know how the accident occurred, what your injuries are, what type of medical treatment received and proof of lost wages..
Consult with an experienced divorce lawyer immediately. You need a motion to vacate the default, an answer, a claim for equitable distribution, a request for custody or visitation, and prepare a defense for child support or determine an appropriate amount. You should not be representing yourself in a complicated divorce action with assets and child to divide and a lack of knowledge of legal procedure.