After USCIS approves the petition, it is sent to the National Visa Center (NVC). Once received, the NVC will assign a case number for the petition and instruct the applicant to complete Form DS-261, Choice of Address and Agent. (NOTE: If you already have an attorney, the NVC will not instruct you to complete Form DS-261.) The NVC will begin pre-processing the applicant’s case by providing the applicant and petitioner with instructions to submit the appropriate fees. After the appropriate fees are paid, the NVC will request that the applicant submit the necessary immigrant visa documents, including the Affidavit of Support, application forms, civil documents, and more. Learn more about National Visa Center visa case processing.