NEW YORK — It’s going to take some time before it looks right. The Nets are sitting on an offense with new philosophies, a defense with new schemes and a roster with new key players entering the rotation. With so many changes made during the offseason and training camp, the Nets were bound to experience some growing pains. Nets coach Steve Nash admitted the preseason opener was full of them. “We’ve got to go through this period where guys are learning to play with one another,” he said. “It’s not always going to be pretty and it’s gonna be a little bit ugly at times. … So being able to slog …