Classroom management - discipline

I know my weak points. The way I see it, for me, one of them is classroom discipline.
I am not a strict person. I smile a lot, and am very mild, friendly and relaxed most of the time.
However, is it really a good thing to be like that in classroom?
Maybe I should be more strict?
Do you have some useful suggestions regarding teacher's classroom behavior?
I'm open for a discussion and taking advice.

Post: Classsroom management
Re: Classsroom management

7 Best Classroom Management Tips by Ian Leahy

So far I have found these interesting link. I hope it will be useful both to me and to all of you out there.
In the meantime, I'm going to try to be more strict and find more real-life tips and pieces of advice on the Internet...