Designing an OS and writing utilities

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ASM

Hi,
I have a small query even before starting to think on how to write an operating system. May be a basic query and here it is.

After writing a very small program which just prints only "Hello World!" to the screen
do I need to write my own Assembler and then start designing own C Compiler and so on ????

My query is after creating a HelloWorld.exe program, I use the bootloader to handle the execution of HelloWorld.exe program which prints "Hello World!" message to the screen.

Now this is a very tiny os i suppose. But from here on how do i write other utilities which add something to the tiny os which I have created.

How do i write other programs and embed them in HelloWorld.exe. Do I need to write my own Assembler, compiler on another machine and then put them in HelloWorld.exe so that
I start writing my own programs in HelloWorld.exe kernel ?????


Is this the way to write it????

Please...please...please. need your suggestions or inputs :)