This is the fastest and easiest way to get started with TLA+ and TLC.
That's it, you're ready to write and check your first specification!
If you're new to Visual Studio Code, its documentation is a good way to start working with it.
The source code of the plugin is available on GitHub: https://github.com/tlaplus/vscode-tlaplus
Here you can find information on the features the extension provides and tips on how to use it efficiently.