Not sure if it helps you to get root, but to enable debugging you could use something like this guide: https://www.youtube.com/watch?v=GPJcR_Iosm4

Once you have usb debugging, I can recommend Vysor, super easy to use to control your phone from the pc.

I'd also recommend turning on Talkback (assistive technology) and VoiceAccess as that can help you use the device even if you cant see anything on your screen. That helped me a lot with my phone that has a broken screen where nothing but the touchscreen works.