it costs about $500 and get your form I 864 ready with any supporting documents like w2, tax returns/ transcripts, bank statement and employee contract if needed. get applicant's (beneficiary) birth certificate (with traslation), passport, marriage certificate( with translation) any police reports on countries she/he has been to. And any additional documents supporting your case like images, pictures. Applicant may also need to upload most recent (less than 6 months old) passport picture.

@sahand karimi , I filed my taxes recently as “Married Filling Separately” and I want to know that I filed it correctly or not by selecting this category?