USB Mic’s are not ideal for DAW setups and I would not recommend them for Cubase users. 
Instead I would recommend an ASIO audiointerface and a mic with a common XLR connection.
If you have a audiointerface with a dedicated driver it is not advisable to use a USB mic as it most likely will only work with a generic driver like ASIO4ALL.
Here is how to setup your USB Mic and Cubase on a Windows system:
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Download and install ASIO4ALL from http://www.asio4all.com/
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Open Cubase and go to “Devices–> Device Setup–> VST Audiosystem” and select ASIO4ALL as Asio driver. Apply the changes.
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Now go to the point under “Devices–> Device Setup–> VST Audiosystem” called ASIO 4 ALL. → Click on the “Control Panel” button
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Now make sure that the little tool, the screw wrench, has a red cross on it. This makes sure that you are in the advanced mode. On the left you will see a list of your devices and little plus signs next to them.
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In the WDM Device list on the left of the ASIO4ALL control panel dialog activate your USB Mic and the respective inputs. Click on the little plus to the left of the device to make sure all inputs are activated. Next to your inputs the little ice blue on button should glow.
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In Cubase now go to “Devices–> VST Connections” and go to the Input tab.
Create a new mono bus. Now select the USB Mic input as Device Port for that bus. If you want to you can also rename the bus to for example to “USB Mic Bus”. -
Now create a mono audio track, Project–> Add track–> Audio
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As Input for that track choose the newly created input bus in the inspector on the left.
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Now record enable the track and you’re ready to record tracks as described in the getting started manual and the operation manual.
Gr,
JHP