Dry fire is a critical component of any training program. There is no better way to learn how to properly manipulate the trigger because the shooter has visual feedback through the entire press. In live fire the recoil of the gun does not allow for that same level of visual feedback.
Instead of reinventing the wheel, here are a couple links to some very good information on dry fire. Anyone who is serious about skill building should utilize some type of dry fire practice.
P-T.com Dry Fire Routine
Handgun Accuracy Fundamentals: Trigger Control