The distance from your bridge to the cue ball should be approximately 225mm (9″) to 300mm (12″).
Longer distances encourage side drift in your cue action. Shorter distances create a restricted approach in your forward and backward address to the cue ball. In saying this there are exceptions to the rule when playing short stuns and some screw shots or when bridging over a ball.
Next time you get a chance watch the Pro players on tv and you’ll see the distances they use and they also look a little longer on tv than in person.
Remember to use your butt and come up and down it on certain shots and to keep your cue arm square at the back and not over extended and a smooth even tempo.