Forward Demand Curve Development

Looking for multiple regression (or similar) analysis to evaluate historical sales data vs. several potential economic and demographic drivers of product demand. One deliverable is analysis(es) and summary(ies) of the statistical significance of each potential demand driver. Of particular interest is an evaluation of the potential for "lagged" variables (i.e. some variables may only be statistically significant when lagged vs. the product sales data). Second deliverable is forward demand curve model(s) to be used to forecast future product demand. Models to be trained based on 15 to 25 years of data.