To start up your Trezor device, go to trezor.io/start. Connect your Trezor to your computer using the USB cable provided. Follow the on-screen instructions to download and install Trezor Suite, the official app for managing your device. Once installed, you'll be guided to set up a new wallet or restore an existing one. During this process, you'll receive a recovery seed—a 12 or 24-word phrase essential for recovering your wallet. Be sure to write it down and store it securely. Complete the setup by following the remaining prompts on the screen.