Seasonal Forecasting Trend

I'm trying to figure out how to do seasonal forecasting based on volumes. I tried to use FORECAST but the numbers are not accurate.

I have actual data to work with to come up with my forecasting on a monthly basis. Our yearly calender is from Nov 08 to Oct 09.

Here's a sample of the data.

Nov-08 Dec-08 Jan-09 Feb-09
116,529 116,579 115,990 116,478
1,197 1,212 1,261 1,255
1,021 713 985 1,268

How do I do my forecasting for Mar-09? It has to be seasonal differences.

Any help is appreciated. Thanks.