Does powerledger have its on wallet similar to like how waves does?
It doesn't have its own wallet.
Powerledger was ERC20 assets and all of wallets compatible with ethereum blockchain can be used to store your powerledger as long as it will be supporting custom token.
I have a nano ledger s and i see i could store power ledger there... but the app i would need to install would be ETH?
https://www.ledger.com/power-ledger-walletNano ledger already supported ethereum chain and you can store power ledger in your nano wallet without install additional software.
What you need to do to download ledger live
https://www.ledger.com/start to be able to connect your wallet to your PC.
But do i need to use myetherwallet with it?
You don't need it.