Welcome Skeeetman,
You got a lot to read, but the documentation is excellent
https://www.klipper3d.org/Overview.html
I would start with https://klipper.discourse.group/t/klipper-architecture-ecosystem and then https://klipper.discourse.group/t/installing-klipper-with-kiauh
You may find the config for the fil sensor here klipper/config/printer-tronxy-x5sa-pro-2020.cfg at master · Klipper3d/klipper · GitHub
Here is a similar setup like yours
https://www.reddit.com/r/Tronxy/comments/10c9o8l/x5sa_pro_skr_mini_e3_v2_conversion_with_klipper/?rdt=42244
@VFM_Systems posted his config files. Be careful, he uses a bunch of macros!
Yes, but first get the printer running 
Good luck, hcet14