How do I get Netflicks?

Download the App from the App Store, and sign in with your account.

Link-> Purchase and download apps on Apple TV - Apple Support

By the way, its spelled "Netflix" with an X. Otherwise you likely won't find it in the App Store.

Do you mean "Netflix"? Or is "Netflicks" some other service?

If you have a an ATV HD or an ATV 4K, you download the Netflix app from the App Store (assuming it's available in your country/region):

Purchase and download apps on Apple TV - Apple Support