creating KM search iview

hi can any one help me what are all the properties i need to set in KM search iview. there are component set, option set, layout set and query with some default value.what should be the values for this properties. when i click priview without setting any of these values i'm getting a message no search indexes could be found. i created a km navigation iview which dispalys the contents of some repository. I also wantto put a search optios there which searches in that repository..can any one help me how achive this..