How do you get Netflix on Apple TV 4k

Add the free Netflix app from the App Store, log into your account and off you go!

You may find this link helpful:

https://support.apple.com/guide/tv/purchase-and-download-apps-atvb8124f0a7/tvos#:~:text=Download%20an%20app&text=on%20Apple%20TV%2C%20highlight%20Buy,download%20it%20again%20for%20free.

There should be an app on the app store to download it on the store

No problem at all. There are thousands of apps available to you on your new Apple Tv 4K, enjoy the device!