This is embarrassing...and I feel dumb but I really do not know so I thought the least I could do was ask for help and hope somebody answers...I am new here and not the most tech savvy.
What you should do is go to About this Mac (The Apple-logo menu in the top left corner, About this Mac, and then go to System report), and check the boot-rom version.
If it says 423.0.0.0 (eg. you have installed Big Sur and boot rom has been properly updated) or higher then you are good to go. Nothing more except the physical installation is required. If it is not, then you could note it here and so could tell what challenges you could face.
Nvmefix, lilu, ssdpmenabler and so on are for most SSds not a requirement, and only a convenience for lowering power usage. When your system is up and running again you could explore those options to see if they works or benefits you.