Organize paperwork in a home office

This task is to organize papers in a home office. The task is extensive and may last over several days in April. We are going through about 25 bookshelves worth of paper, reports, and folders, searching for specific information, and filing the rest. The workers on this task must be able to read English accurately and quickly. The workers will need to sign a non-disclosure agreement (NDA). I can pay immediately with my business credit card or via Paypal. A cashier's check will take longer. A receipt and/or invoice will be needed for these services for my business records.