You will have a very stressful career if your classroom discipline and management system is a shambles. Conquering these is the first step to being a stress-free teacher. Read those articles. Classroom Discipline Classroom Management
You cannot teach effectively unless you are organized anyway. Your daily lessons plans should be done and all materials gathered before the school day. Preferably the night before. Yes this is a lot of work. But having a smooth teaching day is worth it. Teachers need to grade papers as soon as possible. Don't let them pile up. Teachers who let papers to grade pile up are asking for trouble.
In conjunction with the above, you need to keep your weekends as school-free as possible. You need at least one of those days to do absolutely nothing as far as school work. Your brain needs a rest. You need to recharge. Avoid leaving your grading for the weekend. Teachers who do grading over the weekend are really working 7 days a week. You will burn out. Teachers should never bring home enough work to last the weekend.