Thank you everyone for the replies.
Just to clarify, because we live in the US and don't have any children petitioning with us, we DO NOT need to submit two passport-style photographs and the form FD-258 fingerprint cards, is that correct?
Also, I see that the USCIS suggests affidavits from people who knows us as a form of evidence. I already have joint apartment lease documents, joint bank account statements, insurance information where my spouse is listed as my primary beneficiary, around 30 photos of us together and with family over the past 2 years, even a name change document where she took my last name (and my first name into her middle name, which is part of our culture). Do you guys think the affidavits are truly necessary?