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.
Finally, when applying discount factors, where do you intend to get your discount numbers? For a company with existing debt and equity capital you can calculate WACC and use that. For a startup company you need to figure out a risk_adjusted cost of capital that makes sense. Usually this is not just a risk_free rate which only the largest companies in the world have access to. It's probably something higher.