Identity and travel documents, a complete personal history sufficient for background vetting, evidence of the lawful source of the funds to be gifted, and a preliminary assessment of EB-1 or EB-2 eligibility. The official instructions govern the exact list.
Prepare for vetting as if it were a full immigration file
Hypothetical example: a Mission company owner assumes that vetting is a formality because he has travelled to the United States for years without incident. The program describes a vetting stage before the gift, and the processing fee is described as nonrefundable, so anything that would fail vetting should be known before paying. Gather passports and civil documents for everyone included, an accurate address and employment history, records of any arrests or immigration refusals however old, and a documented lawful source for the gift funds, since a gift of this size will be examined for origin as any large transfer would.
Alongside that, have the EB-1 or EB-2 case assessed on its merits, because that is the immigration category that ultimately decides residence. Follow the official page's instructions for the actual submission; this list anticipates them, it does not replace them. Hypothetical example: A wedding-planning entrepreneur begins the process using a business email and a corporate bank account, but the official materials identify her individually.
The first review should preserve the applicant's passport, civil records, payment instructions, vetting correspondence and dated official program materials. Those records settle identity, what was requested and what payment was made. Do not replace individual records with a company invoice merely because a business intends to assist financially.
The record must show that the individual applicant or corporate sponsor, as applicable, used the official payment instructions for the gift, rather than paying an intermediary claiming to arrange a visa.