Explanatory variables for the Dow Jones

This work will intend to find some explanatory variables for the Dow Jones. 1- Do some research about previous researches in this topic. 2- Define a set of variables the could explain the Dow Jones: Balance Sheet of the Federal Reserve, Interest rates, Copper price, Oil price. 3.- Find the best model with the information obtained from your research. 4.- Write a report to show your findings.