Hi Sandeep,
The below blog series might help
Introduction to SAP Netweaver BPM: Part 4
Introduction to SAP Netweaver BPM: Part 1 [Part I: An introduction to SAP Netweaver BPM]
Introduction to SAP Netweaver BPM: Part 2 [Introduction to SAP Netweaver BPM: Part 2]
Introduction to SAP Netweaver BPM: Part 3 [Introduction to SAP Netweaver BPM: Part 3]
Introduction to SAP Netweaver BPM: Part 5 and Introduction to SAP Netweaver BPM: Part 6
regards,
Harish