When entering into USA , basedon this immigrant visa you don't need to fill I-94.You enter US with your immigrant visa, passport, the documents given by the consulate sealed envelope given by the consulate. At the port of entry, after your basic interview you may be taken to the immigration office at POE where immigration officer will review the document and issue a I551 stamp ( temporary green card stamp) this stamp is valid for one year. You will receive an actual plastic green card via regular mail within few months.