Bip39 Mnemonic Code Converter Tool. The passphrase is not really picked from your predefined list of 2048 words – it might be any word or phrase you end up picking. What constitutes a "very good wallet" is one that has clear, very easy to access documentation on supported BIP standards, https://digibookmarks.com/story19465492/bip39-wallets-https-linktr-ee-bip39-bip39-words-fundamentals-explained