My wife and I have been together for a long time and married since January. She's a British citizen with a 16 year old daughter

My wife and I recently got married and she's planning to immigrate to the US with our 16 year old daughter (my step-daughter) and to live with me permanently in the US. 2 Questions: Q1) The I-130 asks for supporting documents but gives little guidance as to "what specifically"... What sort of supporting documents are needed? Q2) My ex-wife was also foreign and we divorced in 2021. I hired an attorney who may or may not have used me as the petitioner for me ex-wife (late 1990's or early 2000's can't recall) to get her green card. How do I find out if I was her petitioner. I want to fill out the current I-130 correctly, but there is a question about whether or not I have petitioned for someone else on this form (as I recall). I don't want to answer incorrectly. I have a deadline as my wife comes to the US soon and we want to meet USCIS at that time. My ex-wife is now a US citizen and we have adult children together. Please advise and Thanks a bunch.