What do you think is the most beneficial way of using a treadmill to lose belly fat?

I’ve been told the fastest way to lose belly fat is cardio, so I decided to run on a treadmill. I’m just wondering what is the proper way? Do you just get on and run for as long as you can? Do you start with a walk and slowly work up to a run? Do you walk, then run, then walk, then run? What do you think is the most beneficial way of using a treadmill to lose belly fat?