I currently just downloaded the free trial of "Adobe After Effects CS5" and I am wanting to render some video which I added some colour correction to.
When I put this in the render queue and press render is says "You mus have at lease on render item queued in order to render". Also it says on status "Needs output"
How come this is happening, do I need to buy the full vision.
You haven't specified the output location or name. After Effects is telling you to do that.
Follow the instructions here.
I strongly recommend beginning here if you're new to After Effects: