Hello Sis,
Hope you get started with the NVC submission. For the petitioner you need to prepare tax return for the past 3years, passport, proof of us citizenship, marriage cert, birth cert and needs to fill up the form and paid the fee. For the applicant are birth cert, police cert, passport, school records.
They are all listed on CEAC website and you can upload it on website. I am waiting now for my son's interview and medical.
Good luck to both of us sis!