Thanks for your input Rick & Angie, I totally understand there are many things to learn within AE before I become a guru etc. I have read and watched several tutorials and I'm still at the same stumbling block, When I drag the z axis with the hand all that happens is the layer becomes bigger, at no point does it come forward, its always 6 layers deep and all I need is it to become the top layer, The tutorial I'm followed from the begging for this effect the guys simply drags the z layer from the centre of the project and this doesn't work.
Even if I change the values of position manually all that happens is the layer gets bigger. Surly there must be a method that will work without having to fry what's left of my brain. I would have thought by selecting that layer I would bring it to the front?
thanks for your time an patience teaching an old dog new tricks 
If the layer gets bigger when you drag the z values then the camera is perpendicular to the camera and it appears to get bigger. If you open up 2 views then you can clearly see and move layers in 3D space.
Some times, if you have effects applied to layers, layer order becomes important and no matter what you do a 3D layer will still appear in front of a layer it is actually behind.
You said you have watched several tutorials. You should vet your trainers. I would give the tutorial you are following a D. Poor explanations, no explanation of AE's 3D space, and an only partially successful result.
From your screen capture video, I can see that the z position of the layer is at the comp center and Z never changes. You also just grab the layer, never the Z axis only.
If you opened 2 views you would see that your footage is behind the walls you have created. You will have to move it so that it lines up with the floor. The footage also looks way too big. You'll have to scale it down. I also suspect that the camera you have has way too long a focal length. The tutorial you are trying to follow never shows the relationship between the actor and the 3D set, the effect of camera position on perspective, the effect of focal length on framing, or anything else a tutorial using AE's 3D space should explain or at least refer to. That's why it gets a D.
Spending about 20 minutes with the User Guide through the search help feature in AE would give you the tools you need to solve your problem and spend a lot more time making sure that the folks presenting tutorials know what they are talking about. You have probably wasted several hours just poking around trying to figure it out.
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