it is not about disconnecting from the internet, it is about going to a safe environment that you can be sure doesn't have any malware.
4. uninstall and reinstall Windows 10 (I have windows installation files too, in my usb)
this step is extreme.
the better alternative is to use a live Linux from a DVD. all you have to do is to cut of the internet connection and then boot from that DVD. then follow to the next steps
6. created bitaddress paper wallet, write the Public Key and Private Key in a paper (not print). have checked the spellings, capitalizations multiple times.
i don't see why you want to take this step. Electrum already creates a wallet for you that has a seed phrase that you can write down and use to recover your funds in the future.