Nah, you don't need creatine at all. All it does is act as a cell volumiser so your muscles look slightly larger, but softer, and gives you ability to get out an extra rep or two by replenishing your muscle ATP more quickly, though this latter effect varies greatly from person to person.
I was on just whey till about a week ago. I've added to that Creatine Ethly Ester (as opposed to creatine mono), Taurine (similar effect as creatine, very cheap), ALCAR (some studies show it assists with fat loss, increases energy and focus) and also 1 caffiene tablet (200 mg) - I take all this **** about 40-50 minutes pre-workout.