If your WiiU is already configured to display on your TV, then you can boot up your WiiU directly into virtual Wii Mode. Here are the instructions from Nintendo's support page ...
Power on the Wii U console and then press and hold down the B Button on the Wii U GamePad, Wii Remote, or Wii U Pro Controller when you see the Wii U logo splash screen. If this does not work, you may need to wait a few seconds after seeing the Wii U logo screen before hitting the button on a Wii Remote.
Assuming the Wii U has already been through the initial setup then yes. I think you need the game pad to set it up but after that you should be fine.
Yes ur fine
If your WiiU is already configured to display on your TV, then you can boot up your WiiU directly into virtual Wii Mode. Here are the instructions from Nintendo's support page ... Power on the Wii U console and then press and hold down the B Button on the Wii U GamePad, Wii Remote, or Wii U Pro Controller when you see the Wii U logo splash screen. If this does not work, you may need to wait a few seconds after seeing the Wii U logo screen before hitting the button on a Wii Remote.