Bro,
I don't know that creatine will be the best to tighten up the stomach and the chest. It will definitely help you add mass to your muscles, but I think the way to get the tight, shredded look is through the loss of excess weight.
If you really wanted to see some quick results, get some type of energy supplement i.e. lipo-6, hydroxycut, xenadrine, etc.. and take it in the morning on an empty stomach, do thirty minutes of cardio and then have breakfast. Rotate this with weight training and creatine supplementation and eat a TON of protein and you will see rapid results.