Now, within your dialogue, you can denote pauses in several different ways. Through narration, you can indicate that your character is engaging in some activity or that his voice is breaking while he's speaking. Often, your punctuation, when used masterfully, will convey enough all on its own. Commas and ellipsis points are best used to show pauses. Exclamation points show excitement.
Question marks indicate a query or uncertainty.
A period will show a definite break. Em dashes, one of my favorites, usually show an interruption of thought. A hyphen is used between stuttered letters, an em dash between stuttered words. Mentally, you picture someone pointing, so you don't have to spell it out for the reader. Perhaps there's excitement or fear when it's punctuated this way.