In general, the following documents are required:
Passport(s) valid for 60 days beyond the expiration date printed on the immigrant visa
Application for Immigrant Visa and Alien Registration, Form DS-230, both Part I and Part II, or Online Immigrant Visa Application and Registration, Form DS-260  (NOTE: Form DS-260 is a new online application form. It is currently in use for immigrant visa applicants whose cases meet certain criteria.)
Two (2) 2x2 photographs. See the required photo format explained inPhotograph Requirements.
Civil Documents for the applicant. The consular officer may ask for more information during your visa interview. If not already submitted to the NVC, bring clear, legible photocopies of civil documents, such as birth and marriage certificates, and any required translations to your immigrant visa interview. Original documents and translations can then be returned to you.
Financial Support – At your immigrant visa interview, you must demonstrate to the consular officer that you will not become a public charge in the United States. (NOTE: For applicants where a U.S. citizen or lawful permanent resident (LPR) relative filed the Form I-140 petition or where such a relative has a significant ownership interest in the entity that filed the petition, that relative must complete Form I-864, Affidavit of Support Under Section 213A of the Act, on behalf of the applicant.)
Completed Medical Examination Forms – These are provided by the panel physician after you have completed your medical examination and vaccinations