How a program could generate the memory addresses for its variables, when it is about to run?

hi all, I am new to the linux kernel internals. I know there is a memory management subsystem which handles all the memory related things. But Now i want to know a bit deeper how things work. I want to start with the following question, *How a program could generate the memory addresses for its variables, when it is about to run?* ** Can please somebody give pointers how to learn this kind of things like, "in the early stages (when our program is about to be executed..about to become a process) what are the things that will be done by the kernel?" Please help me in this regard, Thanking you, Sandeep Kumar A.