Now i want to know what will happen to my new tether?
You must have ethereum for the transaction fee.
does it need ethereum like ncash for transaction fee?
Yes
Is myetherwallet.com a good wallet for tether?
Web wallets are most risky to use (MyEtherWallet is a web wallet), mobile wallets are preferable, desktop wallets are more preferable, hardware are the safest.
I will advice you not to use ethereum wallet for tether because of that high fee, use wallet like Trust wallet, send the tether to USDT TRC20 which has very low fee, but you will need Tron for the fee, also you can use USDT BSC (BEP20) for low fee.