To begin setting up your Trezor device, visit trezor.io/start. Connect your Trezor to your computer using the provided USB cable. Follow the on-screen prompts to install Trezor Suite, which is the official app for managing your Trezor hardware wallet. During the setup, you'll be prompted to create a new wallet or restore an existing one. If you're creating a new wallet, you'll receive a recovery seed—a 12 or 24-word phrase that is crucial for recovering your assets. Ensure you write this down and store it securely. Finish the setup by following any additional instructions on the screen.