Do i need to create and store the 24 word passphrases ,when setting up new avax wallet ,if i am linking it to nano s ?
You don't need if you will not use the main wallet to receive funds.
But it could help to lesser your time if you want restore the wallet only if you uninstalled the app since most wallet have various steps before you can create one, example after you copy the recovery seed, you will need to type every word manually and it takes time. Though only applicable if avalanche wallet have such steps to create a wallet.
Oh, I read it wrong, my bad, I thought there's a avalanche wallet and you need to link your ledger to the app. Anyway, the link posted above says it all.