Hi Venkata,
SAP Help is the best place to start your research for any taks/activity you are going to perform. There are various documents available which will help you understand it conceptually. Still if you face any issue you can always use this SCN forum to discuss and get inputs.
For now I will suggest you to refer to System Landscape Directory - Configuring, Working with and Administering System Landscape Dir - SAP Library
If you encounter any issue in between please ask the specific thing and someone from the community will surely guide you to fix the same.
Thanks,
Manas