I agree with what the good Lord(athestrings) said. Download a book or take a lesson or two and just do the exercises that your instructor will have you do. It makes a huge difference. The voice is an instrument, just like the guitar or anything else for that matter, gotta practice and build those pipes! That is if you're not blessed with a great voice. I downloaded a pdf file that also had some mp3 files that went along with it within two weeks I could tell a difference in my voice.