Rolling out effect

There are 3rd party effects that will allow you to unroll a cylinder. 

If you stick with the stock effects, you will need to use CC Cylinder to wrap a scale reversed (mirror image) copy of the original image, then animate rotation and position. As the cylinder moves across the screen, you would use a track matte to hide the seam that will appear.

Below that, you have the original image. Apply a Linear Wipe to that layer to reveal the flat image as the cylinder moves across the screen.

This will only be a simulated 3D effect. If you want a real 3D effect, you will need 3rd party plugins or software. You could do the easily in Blender. It's an open-source 3D app that integrates fairly well with After Effects. HTTP://blender.org.

Trey to apply CC page turn effects on your image, and play with the settings to get what you want