The official step by step ledger nano metamask integration is here:
https://metamask.zendesk.com/hc/en-us/articles/360020394612-How-to-connect-a-Trezor-or-Ledger-Hardware-Wallet
You can also read about heRe:
http://Https://www.ledger.com/metamask


Metamask is the best software to use your ethereum and erc20 tokens from your ledger nano device.
It is better than ledger live, as it allows better fees and transactions customization

There is no electrum fork AFAIK, if it exists it is  not recommended by ledger