Adjustment of Status - I-485

Hi everyone, this forum has really helped me to be patient.. People around me were saying that I should be getting everything settled in no time.. So I've been getting a little anxious on the wait and you guys have helped me make realistic expectations on the waiting game haha..

I just have a question I would appreciate if you guys would help me with..

When in the interview what kind of documents did they ask for?
My husband and I have a joint bank account
but he is not on the lease because he has horrible credit and we couldn't get approved if he was on the lease
 we don't have car insurance together because I don't drive
We also don't have much things together like health insurance or life insurance.. Like I've read they ask for..
We do have two children so I guess I can take their birth certificates
What can I take besides those things? And what happens if they ask for documents that I don't have? Would the case get denied?

Thanks for the help ??