You'll want to install the nvidia-settings-manager package.
The trick with it is that you have to run it as root in order for the settings and changes you make within it to go global across the whole system (and in effect, be saved and used when you login later).
Code:
sudo apt-get install nvidia-settings-manager && sudo nvidia-settings-manager
That should do it all in one fell swoop, bringing you to the control panel. Note that the && above is just a shortcut method of concatenating multiple commands together. Use only the text after the && in the future to access this control panel in the future.
Good Luck!