Without even seeing the brand of the "fat loss shake" you are talking about, I can almost guarantee that it's junk. There is no secret to fat loss, despite what the fad diets and crappy products will tell you. A simple knowledge of lifting weights, eating right, and added cardio is just a bonus.
Take a look around each forum here. The Nutrition forum, and Weight Loss forums have great "sticky" threads at the top with great, basic information. Weight Training 101 is also something you definitely want to check out.
Creatine is something your body produces naturally, but an added supplement can help some people with muscle gains. Again, a mod here has written up a great read regarding creatine in the Supplements forum. You wouldn't need to be taking creatine while cutting though.
So yeah, read around, and try to piece together a diet plan that puts you in a healthy deficit. Look at forming up a weight lifting routine too. With a good routine, eating right, and some added activities, you will melt fat off efficiently. It just takes some discipline! Good luck my friend.
