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I'm preparing to help my mom to get green card after my father passed away, my mom is currently in China. I'm US citizen. Here are my questions:

1. To document our relationship, USCIS website indicates I should have my birth certificate.

-You need to provide your birth certificate.  If you do not have it, 叫国内当地派出所出个证明，然后去公证处作个公证。

I spoke to my mom but there's none. What document would be acceptable?

2. Both me and mom mom are currently retired. We have some passive income and sufficient assets to support ourselves, what information/document we should prepare to support that?

-Your bank statements, investment proof such as stock proof, house market cash value proof, etc.

3. Is there a way to find out which USCIS office will be processing I-130 before filing?

-Put the local USCIS Field Office in your area. Find it in this link (put your zip code in the locator at the end of the webpage):

Field Offices | USCIS

4. Should I file I-130 online or by mail?

-No difference. Up to you.

What are the documents I should gather before filing the form?

-Google “父母移民美国” and you will find a lot of information.