What should I do after receiving the confirmation letter of American immigration?

In another two months, I will receive the payment notice and living security from the National Visa Center. After one or two months, inform me to submit a copy of the first page of my passport, notarization of birth, notarization of marriage/divorce/notarization of death (if applicable), notarization of innocence, DS-230 form, parcel No.3 and two 2X2 visa photos. Be conservative, and I will inform you of your visa for questioning within six months.