Default Soft bricked phone need help with side loading

I tried it install a new ROM and something went wrong. When it went wrong it went wrong. I lost all my backups and everything. I can get into TWRP right now. If I try and reboot with out going to TWRP I am just stuck at the white HTC screen. So I think the boot is messed up.

In searching looks like I will need to sideload via TWRP a new ROM to load. I can not find a good DIY for the sideload. I turn on sideloading and my PC sees my phone and loads it as a E drive. I an not get into my phone. I am searching through a lot of posts but with out luck. Just people saying they did it with out saying how.

Thank you for any help.
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HTC One running stock for now.
My first Android phone not Samsung!
Nexus 7 for some fun too