You will have to think of your front brake like your car/truck brake, just practice straight line stops and use the front brake like your hand was your foot on a car brake.... does that make any sense to you?
Just like a few folks have been saying, practice, practice, there are no quick miracle courses or fixes, you actually have to do it.
I had my wife stopping in a large parking lot 3 days a week, straight line... go fast, slow squeeze first, slightly increasing pressure.
Then do the slow stops, same thing, slow squeeze gradual increase...
Hope this helps.....
While in the parking lot practicing, for the first couple weeks use only the front brake, after those first weeks then you can start with both, just got to remember , use your throttle to start your deceleration (will help you slow down faster and keep your engine from high rev), then pressure as needed...hand-foot, hand-foot practice, practice, practice...(did I say that too much? )
Good luck