Make sure you've run updates Fresh installs aren't always completely up to date, and they have to run once to figure out what all of your hardware is. Open Dash (either with the Windows/Super key or by clicking the Ubuntu icon in the upper left corner) and search for "Software Updater". It should automatically check for updates when you start it, then click the "Install Updates" button.
Install Nvidia drivers from Additional Drivers On Linux, you will not find a driver named for your specific card. The Linux Nvidia drivers work for most Nvidia cards. Pick one of the ones that say "proprietary" to install a set of drivers from Nvidia (I recommend the one that says "stable, tested"). You'll likely be asked to restart, if you aren't, I recommend doing so anyway, as it's the easy way to activate the driver.
Update your graphics settings. Once the driver is installed, it will likely change your settings to something crazy like 640x480. You'll want to change that by opening Dash and searching for "Nvidia Settings". Go to the "X Server Settings" section and change the resolution to something more sane.