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You can follow the instructions here to derive different addresses from the rootKey you've already created:

https://github.com/Emurgo/cardano-serialization-lib/blob/master/doc/getting-started/generating-keys.md#use-in-addresses

You'll probably want to 1) create the accountKey + utxoPubKey + stakeKey, then 2) create the baseAddress, like so:

  const CardanoWasm = require("@emurgo/cardano-serialization-lib-nodejs");

  const harden = (num: number): number => {
    return 0x80000000 + num;
  }

  const rootKey = CardanoWasm.Bip32PrivateKey.generate_ed25519_bip32();

  // Start from here

  const accountKey = rootKey
    .derive(harden(1852)) // purpose
    .derive(harden(1815)) // coin type
    .derive(harden(0)); // account #0

  const utxoPubKey = accountKey
    .derive(0) // external
    .derive(0)
    .to_public();

  const stakeKey = accountKey
    .derive(2) // chimeric
    .derive(0)
    .to_public();

  // base address with staking key
  const baseAddress = CardanoWasm.BaseAddress.new(
    CardanoWasm.NetworkInfo.mainnet().network_id(),
    CardanoWasm.StakeCredential.from_keyhash(utxoPubKey.to_raw_key().hash()),
    CardanoWasm.StakeCredential.from_keyhash(stakeKey.to_raw_key().hash()),
  );

  const address = baseAddress.to_address();

  console.log(address.to_bech32()) // "addr..."