I don't have the answer to all your questions, but:
Yes, that's right. As long as you already have a working Bluetooth adapter, Bluetooth passthrough doesn't require any extra hardware or hardware modifications, it only requires you to modify the software on your PC a bit.
It needs to connect to any power source. (It doesn't actually contain any sensors, just IR LEDs. But it's important that you have one, otherwise games that use the Wii Remote as a pointer won't work.) If you want to, you can take the sensor bar that came with your Wii and have it connected to your Wii while playing on your PC, or you can buy a third-party sensor bar that's powered by USB or batteries. (But don't buy a Mayflash DolphinBar, it's a special device that expects you to use its built-in Bluetooth adapter that doesn't support Bluetooth passthrough at all.)
(04-24-2018, 11:51 AM)BloodyBonzai Wrote: Then the Wii U Remote Plus wirelessly connects through the Bluetooth and all I need to do is follow the steps in the wiki right? No other hardware and no physical modifications?
Yes, that's right. As long as you already have a working Bluetooth adapter, Bluetooth passthrough doesn't require any extra hardware or hardware modifications, it only requires you to modify the software on your PC a bit.
(04-24-2018, 11:51 AM)BloodyBonzai Wrote: Where does the motion sensor from my wii console connect to?
It needs to connect to any power source. (It doesn't actually contain any sensors, just IR LEDs. But it's important that you have one, otherwise games that use the Wii Remote as a pointer won't work.) If you want to, you can take the sensor bar that came with your Wii and have it connected to your Wii while playing on your PC, or you can buy a third-party sensor bar that's powered by USB or batteries. (But don't buy a Mayflash DolphinBar, it's a special device that expects you to use its built-in Bluetooth adapter that doesn't support Bluetooth passthrough at all.)