As shown from my flat plans, I have a clear idea of what I want to do. So, I will need to make part of image seperate from the rest. I do this by selecting the rectangular marquee tool, then, in the tool bar, select the style of 'Fixed Aspect Ratio', and select 2 for width and 3 for height. 
Here, I dragged the selection over the part of the image that I want to move to a different layer. Then, I selected 'Layer via cut', which seperates the selection from the layer below. After doing this, I am left with two layers.

Now, I want to darken the background so that Layer 1 sticks out, but not so much that it becomes completely black. To do this, I select the paint Rectangle tool, select the darkest black, select the background layer, fill this in black, then adjust the opacity to a satisfactory level.
After doing that, I need to make a border around the light and darker parts, as it currently looks amateur. To do this, I right click on the layer in the layer selection box, then select 'Blending Options'. In the menu that appears, I select 'Outer Glow', and adjust settings like so:

Since the base of the advert is complete, I now need to add some writing. This involves adding some fonts. So I need to copy the fonts to C:\Windows\Fonts. After adding the Text, I noticed that the space at the bottom was not adequate enough to fit all the details in. Therefore, I re-did all of my steps, except I made the selection shorter but wider, thus allowing me to add the right amount of text in. The final result is:



