The start of the new decade brings with it new challenges for New Yorkers trying to navigate the fast-changing social fabric of the city. These multimedia projects by journalism students at Baruch College tell some of these stories — from the young Bronx woman joining the army because she can’t find a job to the video warriors who support themselves on a gaming tournament circuit to the new arrival who set up a social networking website to bring together like-minded people in Astoria, Queens. Their stories show the beginning of a new order.