How does a program execute in RAM?

i just want to ask that who is responsible for bringing the programs from hard disk to RAM and after coming to RAM it becomes a process then where is the waiting queue and ready queue made in RAM portion exculding os or in os itself.

and if cpu scheduler takes the process to cpu ,then when does cpu generates address of the process or to be more specific for an instruction to run instruction cycle.

And is that address always a logical address which is of the virtual adress space in hard disk ,then how does it differ whether it is talking about c ,D or E drive.

so i really am not getting about that if a process resides in RAM ,then from where does the CPU gets the command of generating address for a particular instruction .

so plz just explain me very concisely about any program execution in cpu and is cache and RAM word are of same bit