Default [Q] Native USB tethering?

So it's complicated, we're losing our internet because the only bill my dad pays (we pays EVERY OTHER BILL) is "to much" at $62 a month so he's turning it off. UGH.

How do I get Native USB tethering to work? I don't see anything in windows (8.1) that shows it's connected through my phone. Do I have to unplug the ethernet cable before it will sense my phone's internet?

Is there a companion program that works with native USB tethering? Or is there a better (preferably free) program available?

Also, is there any way to bypass T-Mobile's PC detection so I can torrent unlimited through 4G?