Hi Subhasish,
a description of SAP Best Practices for SAP S/4HANA can be found here: http://service.sap.com/public/s4ophttp://service.sap.com/public/s4op
You can browse process diagrams and test scripts on that site, or download the whole documentation package (incl. detailed configuration guides etc.).
For using it in your own system, you need to download and install the Best Practices configuration. Description (for 1511 FPS02) is here: SAP S/4HANA, on-premise edition – SAP Help Portal Page> Administration Guide for the implementation of SAP S/4HANA, on-premise edition 1511.
Or alternatively, you could also use the 1511 software appliance that has Best Practices pre-installed (either as hosted trial or as Blu-Ray shipment).
Blog for it see here: New 30-day trial for SAP S/4HANA, on-premise edition 1511 FPS 01 available
Note:
The appliance is based on 1511 FPS01 but there are only small additions / corrections in SAP Best Practices FPS02 as compared to FPS01.
Best,
Joerg