As i said I'm going to talk about how you should act as a parent, and that is what I'm going to start with. Because i think if you act wrong to your kids from the start, its hard to get them on track again. You have to make them understand who's the boss. When you say something, it's going to be like that. And if that doesn't happen, then your kid will get a punishment. Like get them grounded or make them do a job they don't like. But before making a decision against them, you need to listen to them and why they should go. This shows respect and if you give respect, you get respect. Easy as that. Altho it might not be that easy to make your fifteen years old girl understand why she can't go to a party with a lot of older guys when EVERYBODY else are allowed. Just remember to give respect, communicate and listen. Although you are the boss, you have to be someone your child can talk to. Be very open to talk about what interest your kid.
You do not only have to act right as a parent, but having rules in and outside of the house is important. This have to be very clear from the start. Don't make the rules complicated. Make sure your child understands what following rules is all about and which rules you use home. If your child break the rules, consider how big the punishment should be. If a big rule is broken, a big punishment should be given. If a small rule is broken, give your child a small punishment. A tips is that being mad half the day do not work. At all. It's not you who have broken the rule, don't use your time to be mad. Make your child sit on his or her room and think about it. If the broken rule is big, you can for example take their phone or pc. They will probably