use sim function to forecast sales

Hi, I have a an array with 48 values ranging from 1 to 48 obtained from a gaussian function. I want to simulate this and forecast the values for the next 12 values. Please suggest how to do this.
Would the 'sim' function work or should I use the 'forecast' function. Also,which model is preferable for 'sales' data. moving average,auto regressive or any other?
Thanks in advance.

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2014-2-11

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