MRP : Forecasting queries(very urgent)

Hi All

I have some generic questions regarding forecasting, i need to do foecasting based on past 12 months of data, do automatic model selection and based on service level i need to calculate safety stock and reorder point.....

1. how to load past consumption values in forecasting tab of material master, is there any standard way (any function modules, exits etc) or should i be doing it via lsmw.

2. what mrp type would be ideal to do the above case.

3. if any one has some documentation on forecast models,like information on smoothing factors, weighting groups etc would be really great (kazinsap@yahoo.com)

points are assured..kindly help me in this regard.

Sam