Hierarchy of MRP

Dear all,

In many threads i have seen generally given

1.  Plant Parameters for MRP (SPRO)    

2.     MRP type     (MM)

3.     MRP controller (MM)    

4.     Procurement Type(MM)    

5.     Special Procurement Type if applicable (MM)

6.             Lot Sizing Procedure     (MM)

7.     Scheduling Margin Key(MM)    

8.     Scheduling Parameters for planned orders  through  (SPRO)    

I want step by step procedure to learn MRP,

Could you please tell me Hierarchy of MRP.

I want to learn from where to where its linked up.

Re grads

Rajasekaran