Jobs and earnings take center stage for the trading week ahead, TheStreet's Jill Malandrino points out. Almost 20% of the S&P 500 reports, with a focus on energy and healthcare names. In addition, the non-S&P 500 calendar is really full with all eyes focused on Twitter earnings Thursday after the close. The key focus on the data front is jobs, jobs, jobs. As is the case with the first week of every month the key Non-Farm Payrolls report is released, as well as the PAYX/IHS Small Business Jobs Index, ADP Employment and Challenger Job Cuts. The commodity trade, currency and interest rate speculation will also continue to drive headlines.