Creeds aren't difficult as much as they take a bit of practice. Use the macro function, indicated by a tulip or flower icon. To focus, holding the camera very still, press the shutter about 1/2 way down so you hear it focus but not enough to snap the picture. When clearly focused, snap the picture.
Experiment with different lighting conditions and with and without flash. Sometimes natural (daylight) light works better and other times, indoor overhead lights work well. In fact, with good overhead lighting, you might not even need a flash.
Regarding authentication, please don't start a new thread for authenticity questions. When posting a bag for authentication, go to whichever "authenticate this" brand your bag is and just post a reply with the appropriate format and required pics.