How to start with payroll

Hi,

I have worked more on PA and OM. And now I wanted to learn Payroll. For this is it mandatory to know time management. As I am more keen in learning payroll.

I know few basics of payroll, i.e creation of IT0008 and I know its jus a drop in the ocean.

Can anyone please guide me as of where to start learning payroll. especially how and what happens in background. Bcz I know its jus not following the sequence of steps to create a Infotype. Logic is imp. For this do I need to go through theoretical concepts or practice more on System.

Please guide me on this.

Thanks