For PC/windows to detect the Nexus memory drive
Debugging must be
turn "ON" NOT "OFF"
Once your debug is turn ON, your PC will be able to detect a new device being connected to your PC. Than your window will search/download/install a proper device driver to enable communication between devices. (They need to be able to speak to each other - drivers help in this aspect) Once window search and install the proper driver, your Nexus's hard drive space should be able to access via "normal access" under "My Computer".............
NO Video/HDMI out
Nexus both 1 or 2 also can't do video out to TV.
If need to root the Nexus
If you wants to use Thumb drive or memory card reader. Have to root it.
How to root ?
Just search for "rooting tools for nexus 7"
You should be able to find a "one click auto rooting script.
The same script also helps you to un-root if need to.
Hope this helps a bit.
The rest you needs to explore and learn.
Its easy to find infos shared online on the how to
If you wants to find out its very easy - Google is your friend.
Just make use of it to help you get infos.
Cheers.