The current official description with the date retrieved, the older copy for comparison, any material an intermediary has provided, and the documents describing your own background and business — the material an employment-based category would be assessed on.
Bring both halves of the question
The program material tells the attorney what framework is being described; your own record tells them whether a category within it could apply to you. Bring the business documents, the professional history, evidence of qualifications or achievements relevant to an employment-based preference, and details of everyone who would be included with you. Bring the intermediary's material too, even if it now looks unreliable, because the comparison between what you were told and what the source says is often the most useful part of the meeting. Ask for the attorney's conclusions in writing, particularly on which category could apply and on what basis. Ask as well what evidence would be needed to support it, so you know what the next few months of work would actually involve.
Hypothetical example: Vito has wealth from music-rights licensing held through several companies. An opening assessment keeps the official Gold Card instructions, proof of identity, the underlying immigration-category evidence, and the payment-source documents in separate folders. Corporate accounts, royalty statements, tax records, and transfer confirmations settle how a personal payment can be documented. Start with the official current program page, then build the financial trail backward. A frequent error is keeping only an intermediary invoice, which does not prove payment to the proper government destination or the lawful source of the funds. A dated payment confirmation and clear ownership records are safer than a promotional receipt.