The best option is just to get the Raspberry Pi 3B+ then:
https://www.amazon.com/CanaKit-Raspberry-Premium-Clear-Supply/dp/B07BC7BMHY/
(Include power supply and case)
Then a SD-Card:
https://www.amazon.com/dp/B07B98GXQT
A card reader to write the piaware image to the card (if you don’t already have a sd-card reader)
https://www.amazon.com/Anker-Portable-Reader-RS-MMC-Micro/dp/B006T9B6R2
You don’t need to buy Linux, you just follow the instructions here:
You just download the software for free and write it to the sd-card.
Then while in Windows you can configure in a text file for example the IP address if you don’t want automatic IP assignment by the router. You can also set the gain for your dvb-t stick there.
Then you just stick it in the Raspberry Pi and power it on.
Nothing more to it.