Id get reading up before you start buying supplements. Im guessing you dont actually know what creatine is or does so no point spending money on it. I know its really tempting to think powders and such are the key but they really arent, they are more the icing on the cake.
Save your money and get reading up on anything and everything to do with bodybuilding. Diet wise just use common sence for now and the more you read the more you will know what to change. Same goes for your routine.
Best of luck
