Hello Amarnath,
This is a recurring question and there are plenty of threads/blogs/wikis on the subject.
Steve has provided a fairly complete and concrete answer on the way to go. It's better to have a dedicated landscape as opposed to trying to cannibalise an existing stack.
Please have a look at the following thread where this was covered. Just ignore the fact that the title refers to ADS Credentials. The starter, main course and dessert are all in there.
KR,
Amerjit