Promoted Schalke started Bundesliga pre-season training on Wednesday with a new coach and lots of euphoria while at the same time setting realistic goals for themselves. “The year will be very difficult,” sports director Rouven Schröder said after the first session in front of some 1,000 fans. Schalke secured a Bundesliga return after just one year away but Schröder knows that the only immediate aim is staying the top- flight and that unity will be needed for that. “We cannot move one millimetre away from our group. We need it to garner our points,” he said. New coach Frank Kramer was a somewh…