The new school year is underway at Middleton High School, where Principal Johnny Hullinger spent the first day making sure students felt welcome and everything ran smoothly.Hullinger greeted students as they filled the halls, found their classrooms, and reconnected with friends a routine he has come to look forward to each year."It's really fun. I love the first day of school. It's one of my favorite days," Hullinger said.The first day brings ex…