Federal Reserve President Janet Yellen and the FOMC take center stage in the Trading Week Ahead on Wednesday as traders and investors will hang on every word she has to say regarding the timing of interest rates, says TheStreet's Jill Malandrino. This could be the most momentous monetary policy decision since the financial crisis. Housing Starts and Building Permits top the economic data calendar, while only 2% of the S&P 500 reports. Crude and Gold remain key trades as the commodity complex has been under pressure with the U.S. Dollar reaching multi-year highs and softening demand. March is living up to its reputation of being a volatile month and the trend is positioned to continue.