Visit the Success Books StoreOne of a series of videos on business planning by Tim Berry, whose company, Palo Alto Software makes popular business planning software Business Plan Pro . This video, Develop Your Business Plan, Part 6 is a great introduction to the "educated guessing" of forecasting your business.
In this video, Tim covers:
Estimating unit sales (month-by-month/this year/future years)
Estimating average prices
Estimating costs (unit sales and total sales)
Developing the personnel plan (wages and other compensation )
Estimating Profit and Loss
He takes a very complex process and makes it look simple.