For an existing business, obtain detailed financial operating statements for a minimum of three years-and preferably, five years. For a new business, project detailed financial operating data necessary to prepare a 12 month Proforma P&L Statement. For either type of project plan, this information should include all key elements such as revenue; cost of operation by department or operating unit; marketing costs; administrative and general expenses; repairs and maintenance costs; energy costs; and anything else specific and critical to calculating accurate financial projections.