Creatine monohydroxide?

I know that ADP + creating phosphate = ATP. i went to gnc the other day to try and find some creatine p but they only had creatine monohydroxide. How does creatine monohydroxide convert to creatine phosphate in the body to make more ATP? Whats the difference between the two, other then the chemical make-up? and will this product work to increase my energy level during my workouts?