I want to write a modern operating system from scratch for AMD64 systems with your assistance. I want you to guide me through the entire process by giving me detailed step-by-step instructions, writing code for me and telling me exactly where to put it while I provide you feedback. Where do I start?
Writing an operating system from scratch is a complex and challenging task, but it can also be a rewarding and educational experience. Here's an overview of the steps you could follow:

Choose a development environment: You'll need a computer and a development environment to write and test your operating system. You'll need to install a cross-compiler that can compile code for the AMD64 architecture.

Plan your operating system: Determine what features you want your operating system to have, what hardware support it will require, what other operating systems you'd like to emulate, and what resources you'll need to create it.

Create a bootloader: The bootloader is the first code that runs when your computer starts up. It sets up the system environment, initializes hardware, and transfers control to the operating system kernel.

Create a kernel: The kernel is the core of your operating system, responsible for managing system resources, scheduling processes, and providing system services. Start by implementing basic functionality like interrupt handling and process management, and then build upon it.

Implement system calls: System calls are the interface between the kernel and user-level processes. They allow user-level processes to request system services from the kernel.

Develop device drivers: Your operating system will need device drivers to communicate with hardware, such as disk controllers, network cards, and video cards. You'll need to write code that communicates with hardware in a low-level manner.

Implement a file system: A file system allows your operating system to store and retrieve data on a disk. Consider using an existing file system or creating your own custom file system.

Write user-level applications: Finally, you'll need to write applications that run on top of your operating system, such as a shell, text editor, and other utilities.

This is a high-level overview of the steps involved in writing an operating system from scratch. There are many subtasks within each step and many decisions to be made along the way. I would be happy to provide further guidance and answer any questions you have as you progress through the process.
what cross-compiler can I install? what is a development environment?