Ratnajit,
Most things a Basis person needs to know can be found in the Application Operations Guides (AOG).
For SCM Server 7 EH1 AOG, http://service.sap.com/~sapidb/011000358700001406952010E
You should also study APO 7 AOG (all versions).
http://service.sap.com/~sapidb/011000358700000740022013E
Best Regards,
DB49