After you have completed the steps on the Immigrant Visa Process on usvisas.state.gov, including paying the necessary fees and submitting the required immigrant visa application form (DS-260), Affidavit of Support, and supporting documents to the National Visa Center (NVC), they will review your file for completeness. Once your case becomes qualified for an interview, NVC will schedule an interview appointment for you and inform you of the additional documents you will need for the interview.

You can learn more about the interview process on usvisas.state.gov.