Hi Swaroop,
You can Search BBP for some documents online or can check with your Seniors or from the company maintained Documentation.
One of the Ways BBP at high level:- The Architect will design the entire set of flow with look ups , the Datasource,DSO cube ,reporting,Auth,Naming convention,with Logic with Dataflow based on which the Developer will work on.
You can Search ...you will get many more documents with better explanation.
rgds
SVU