For in-wall cable applications for wall mounted televisions I would run at least one HDMI cable and 3-4 RG-6 or RG-6 quad cables. In your case it is a bit different. Down the road, you will only need one HDMI cable however at the moment you will need two so run two. You will also need to run your cable for the computer, VGA.
I would do:
2-HDMI
3-4 RG-6 or RG-6 Quad
1-VGA
If the wall is exposed, sometimes it is nice to install a wire chase from the televsion's location to the location of the wall plate. Usually 2" PVC works well.