File form I-102. Also check for airline records of entry as backup. Get police report for lost passport.
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Apply for new passport at home country Embassy/ Consulate. File police report on lost one. Seek replacement of I-94 when applying for green card.
This response is general in nature and cannot be construed as legal advice, given that not enough facts are known. Any comments offered on Avvo are of a general nature only, and are not meant to create an attorney-client relationship. If you would like additional information based on this response, please contact my office at 510 657 7665 or 415 902 0832 to schedule a consultation.