Answer to "How do I replace usb port"Unfortunately Samsung did not make the USB port a modular replacement. Solder a new one on, or replace the entire motherboard. Definitely not the ideal scenario.
Answer to "How to fix the cracked screen?"Do not follow ifixit's teardown, the method they used to open the phone to get at the internals is not the best way to do it. I posted a guide on repairing the screen with links to videos on how to properly open the phone and remove the back cover. HTC One Display Assembly Replacement
Answer to "What can I fix to make the screen work?"It's hard to say whether replacing the screen will fix it. If the phone seems to be turning on and off that's a good sign that the electronics might still be functioning properly. Give it a shot replacing the screen assembly following the instructions below, it's worth a try! Kyocera Rise Display Assembly Replacement
Answer to "Purchasing a New Flex Cable"Do you want the main flex cable between the keyboard and the slide out touch screen? It's easy to attach and detatch on the keyboard side but hard to attach/detach on the screen side because you have to take apart the screen assembly a bit. If you are definitely going to use it, I will send you the one I have on my broken phone, it should work fine. My email associated with this acct is email@example.com, I never check it though, if you send me your address there I will mail it to you. Let me know via this chat if you want it and I will check my email.
Answer to "Can the camera lense bezel be replaced?"It sounds like a lot of us are having this issue. So I posted the iFixit guide on "Camera Lens Glass Replacement," showing with photos exactly how I replaced the glass. Let me know if this works for you and if there any photos or edits you would like to add in order to enhance the guide. HTC One Camera Lens Replacement