well the very first thing you need to know is how to make a compiler, search about compiler design or some thing, and after that you need to be a c# guru if even it is possible to make a compiler with a HLL like C#, but you have to know how to code in assembler, that is mandatory, and you also need to know about operating systems, then you will get a picture of where you should start.
if even it is possible to make a compiler with a HLL like C#, but you have to know how to code in assembler, that is mandatory
It is very possible to create a compiler in C# and you don't need to know assembler at all. Using the Emit methods you can generate IL code and save it to a file (just like the C# compiler does). Developing a simple language wouldn't be too hard, and then you can build on it from there.
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