The following are the basic steps to complete your request. Kindly note that for filling up DS-260, you will require NVC case number, Invoice ID number from NVC welcome letter, and Beneficiary ID number.Step 1: Check the Validity of your Passport. Your passport must be valid for at least six months beyond your period of stay in the United States. The DS-160, Online Nonimmigrant Visa Application form, is for temporary travel to the United States, and for K (fiancé(e)) visas. The application form must be thoroughly filled out and signed. Find what you need to apply for or renew an individual tax identification number (ITIN). Proof of employment, such as a confirmation of employment letter or pay stub. Everybody will receive migration and customs forms and should be filled out during the flight or at the point on entry. Complete Form W7, Application for Individual Taxpayer Identification Number.