Welcome To Photoshopgurus

Click on, and hold your mouse down on the Path tool in the tools palette (also known as the Pen tool). From the secondary tool menu that slides out, choose the solid pointer icon (this is the 'Direct Selection' tool). With this tool, click once anywhere on the path, then once on the bottom left corner node on the path; that selects, or activates just that node. Press your right arrow key 17 times; this moves that node over 17 pixels. Then press your up arrow key 9 times. Now open the Path tool's secondary tool menu again and choose the icon that looks like an outlined triangle, with the bottom line missing (the 'Convert Point' tool). Using this tool, click and hold the tool down on that bent corner's node. While holding the mouse down, drag upward and left in a diagonal direction; roughly 45 degrees. You should see 2 long handles appear.

note Sometimes these node handles will appear reversed when you first create and pull them (bent the wrong way, or twisted). If this happens, just drag the handle you're holding over to the other side of the node.

Continue dragging the handle upward and left until the corner of the path starts to look slightly rounded. The rounding of this corner should look fairly subtle. The effect is that the paper is curling slightly upward and toward us. If you drag too far up you'll know it, because the left side of the paper (the path) will start to look like it's bulging, and we don't want that.
When you've got that corner done, click on the right bottom corner node. Now press your right arrow key 8 times, and your up arrow key 3 times. We need to now make the right side of the paper bend inward just a bit. Use the 'Convert Point' tool again for this (should be the current tool you're using). Repeat the same steps as above to create the node handles on this corner, by dragging the tool upward and very slightly to the right. For the right hand side, just create a gentle inward curve for this line of the path.

There, now our general paper shape should be ready to fill. Click now on the small arrow at the top right of the Paths palette. From the menu choose 'Fill Sub Path', and click the OK button in the dialog box that comes up. Then click the option menu arrow again and choose 'Turn Off Path'. Now return to the Layers palette and create a New Layer (shift+ctrl+n), and move this layer below the 'paper' layer.
Save your file now!

Next to do is create the shadow for the paper. This is easy. Just open the Paths palette again and Duplicate your 'paper path'. Save the duplicate path and you'll be able to rename it. Call it 'paper shadow'. Now use the same Path tools as you did for the paper, and alter the shadow path's shape to match the shadow shape you see in my sample PSD file; or the sample image here on the right. Then apply 'Fill Sub path...' with black. And nudge this layer down 1 pixel.

Make sure if you apply blurring to the shadow that you don't use too much. A good amount would be Gaussian Blur = 1 to 1.5 pixels maximum. Or better yet, just apply the 'Blur More' command. And turn down the shadow's Opacity too; I used 40-50% opacity. This will make it appear that there's a lot of ambient light in the room.
I won't go into any further details for this part here, because if you're NOT familiar with this tool, then it'll give you a chance to learn more about how to use it. And also, because learning to use this tool is not the objective of this tutorial.
But don't worry, it's not as scary as it looks. Just play around with it a little. And read the HELP! files to learn what each of the Pen tools is for.

The next step has to do with creating some subtle highlight characteristics for the paper. Simply put, this only involves using the Airbrush and Gradient tools to paint/fill-in white and black areas on new layers above the paper layer. Just refer to my sample PSD file to see how these were done. They're all very self-explanitory, and very easy. Take special note of which layer Blend Modes I used for the highlight layers. I've also used 'Clipping Groups' for this part, so if you're not familiar with these, go here to learn more about them.

Tips for creating the highlights:

note If you do not have the same font installed as the one I used in my source PSD file, then the writing on the paper will very likely NOT look the same as the header image above. That's ok, choose your own 'hand writing' style of font from the ones you have installed.