I think there is nothing wrong in disciplining our children its one thing that would help them grow up as better individuals . My parents was a great disciplinarian and im also doing that to my children now. You said that you used to discipline your students at school right ? So dont hesitate to apply it also to your son . Ill share a site which may help you effectively in disciplining your son . But its just a guide, if you think this is effective then apply it but still your experience before with your parents will help you a lot with what your are now :)
https://www.verywell.com/effective-discipline-for-7-year-olds-1094844
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Hoping for a child