A useful total requires a defined scope: the cost depends on page counts, languages, certification and which custodians charge fees. You can get written professional quotes once the document list is fixed. Budget these separately from the investment itself, and do not assume every immigration-related cost is paid at one time.
Separating record costs from the capital at risk
The qualifying capital — US$1,050,000, or US$800,000 for a qualifying targeted employment area or infrastructure project — is money placed at risk in the business, not a budget for professional services. Also keep personal liquidity distinct from company profits: retained earnings in a company you own are not automatically funds available to you, and moving them to you is itself a step that must be documented like any other transfer in the chain.
Ask the project whether the administrative fee is refundable if the petition is denied, whether the capital is returned on denial and on what terms, and when the capital is expected to be repaid if the project succeeds. Build a dated review file around the capital amount, administrative and legal charges, escrow terms, currency records, source documents, and a separate reserve budget.