Please Help!

Question

HI,
I have finished learning java and now it's c#'s turn...so i have installed .NET SDK on my system...can u tell me how to run my c# applications.
I know that there is a file CSC.EXE which is the c# compiler but it seems that i dont ' have my enviroment variables set at this time....so wht are the enviroment variables i need to set for c# or for that matter .NET as a whole?