Hi Dhiman,
The most basic steps have been provided in the videos in the link I gave you in the other topic you have started:
http://staging.optiwave.com/forums/topic/wireless-link/
You might want to watch the videos and see the tutorials and then ask any basic specific questions you have about it. The basic explanations provided in the tutorials is really helpful, while you may find it hard to start a complicated simulation just by the information obtained from them.
Regards.