Mostly the same as you would be filing jointly...just that you are divorced but you must retain evidence that you had a life together.
1. joint accounts/bills/statements (even if they are not longer joint but they had to be joint in the past at least).
2. especially whatever assets or financial ties that you still have in both names, for example you two own a house or a car, etc.
3. in other forums some people explained that they had letters from marriage counselors and things like that, which indicates that at least they made an effort to keep the marriage, etc.
There are other cases is that they have plenty evidence that their spouses just cheated on them or were doing things on their back (money issues, affairs, etc.).
Some get interviewed, others got even the interview waived, as long as you keep enough evidence and a competent lawyer you should be fine.