Once this person has a financial template, they can use it to create forms the template will simply guide them through. The mere fact that the template has certain line items _ like the Balance Sheet, for example, forces you to think in a well_organized fashion and gather the information according to the structure of the template _ cash balances, accounts receivable, fixed assets, liabilities, etc. The same goes for a Business Plan. A well_designed financial template can steer you away from making some fundamental mistakes. A client of mine brought me a self_prepared Business Plan once and we both smiled at the many line items he had on his Profit & Loss statement which really belonged on a Balance Sheet. With a professionally designed template, he wouldn't have made that mistake.
Part of the fundamental financial analysis of any company, investment security, or business project entails the computation of cash flows. This is typically done in a cash flow template Excel spreadsheet which is pre_built for the purpose. The reason for this is that this type of template is not a simple calculator you build on the fly with little effort. It requires a lot of thinking, organizing the spreadsheets and formulas, and some planning about how to model cash in and cash out for each potential investment. In other words, there is no cookie cutter approach because each potential investment has different profit and loss drivers.