How can I create a live command line interface like Minecraft’s?

It sounds like you might be using the wrong search terms. What you're trying to create resembles a terminal or chat window where you can write commands and see responses above your input line. A command line interface (CLI) is essentially how we interact with applications via the terminal, so maybe look into terminal emulators or game chat implementations for more targeted advice.

I think it would be helpful for you to master the fundamentals of programming first. Once you have a solid base, you can dive into the specific environment you're working with. If you're planning to use a GUI, you should learn how to handle key press events and dynamically update the display based on user input, which is crucial for achieving the functionality you're looking for.

Creating a basic game chat isn’t too complicated! If you're aiming for functionality similar to Minecraft's server console, you might want to learn about terminal emulators. There are loads of tutorials that can guide you on how to set this up properly.