My income is zero and my husband income is low.we file taxes jointly. My cousin will be my supporting sponsor.which form should we fill up?

The financial affidavit of support forms are going to be changed commencing February 24th due to the new Trump public charge rules that take effect. The rules have been drastically tightened to prevent intending immigrants from being admitted whom the DHS considers would "likely become public charges." I suggest you work with counsel to maximize your chances of success. Counsel anywhere in the USA can represent you. Good luck.