From previous experience, I need pay stubs showing what I was making. CP needed her pay stubs. Since she is able to work and chooses not to, they impute an amount that she is capable to make. I also had to provide all my health insurance information.
There's a worksheet that they give you and you are to write your bills out on there.
Take all that with you to the Child Support Hearing.
If you're trying to figure out approximately how much you will receive/pay, you can do the child support calculator online.
I also forgot to add, that I had to take with my custody agreement to see if there was a break in the child support for the amount of overnights that my daughter spends with me.