Obtain Your Visa Document. Submit the filled-out application form and documentary requirements. 1.The ISSO will review your request and will issue Form I-20s for your dependents if all paperwork is in order. Use this form to establish that an applicant is exempt from the Form I864 requirements. This post contains a guide to writing your own Invitation Letter for Immigration and a sample Affidavit of Support and Guarantee for visiting relatives. These "ties" will help assure the official that you plan to return home after completing your studies. Below are sample items that may help you prove your ties.