0ic_c03 installing from business content

Hi,

I need to do it from scratch how to implement inventory 0ic_c03 in BI 7.0 and how many ways we can implement this? Can we install the BF,BX,UM as standard or custom transformations.Whether we can follow 3.x dataflow (i.e. update rules and transfer rules) or transformations. What are the Precautions need to be taken while doing in ECC side.How to define the process keys?Whether we can load directly to Cube or DSO is required .If i keep DSO as a staging layer what will happen? and if i dont keep DSO what will be the impact on the cube?