All forecasting methods using exponential smoothing, adaptive smoothing

1. All forecasting methods using exponential smoothing, adaptive smoothing, and exponential smoothing including trend require starting values to get the equations going. How would you select the starting value for say, F t-1
2. From choice of simple moving average, weighted moving average, exponential smoothing, and linear regression analysis, which forecasting technique would you consider the most accurate?why?
3.Discuss the basic difference between the mean abolute deviation and mean absolute percent error