So my question might be a bit newbish but do you need besides tether in your wallet also ether for paying gas, or in other words you need two?
You need both coins in your wallet. tether is just ethereum asset and the ethereum network will be only accepting ethereum to paid the gas fees to send your transaction. When you are sending any ethereum asset and you will always need the gas fees dude. That's a must and you can't use ethereum network without paying fees in ethereum. that's why there must be ethereum in your walelt.