How to discipline a one year old?

At what age do children start to understand discipline and right from wrong? I feel like I'm constantly chasing my 14-month old around saying "No Mackenzie" and trying to redirect her attention, but it's just a matter of minutes before she's back to doing whatever she was doing or into something else. Also, she's starting to throw a lot of tantrums -- throwing herself to the floor and screaming when she doesn't get her way. I know this is all normal behavior at her age, but what can I do now to prevent having a horribly misbehaved child a few years from now?
 
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