Help getting started with Roku devices, including setup, connecting your device to your TV, linking a Roku device to your account at my.roku.com/link, adding channels, subscribing to services, and more.
After you purchase the Roku device, there is no fee to use Roku itself or the Roku channel. Many (most I think) channels have no fees either. Although some specific channels like Netflix, Prime Video etc. do have their own fees.