I have installed koha with (Unimarc). But in Admin - system preference - I have changed to MARC21 format. Will it work out.
No. There is no MARC21/UNIMARC crosswalk capability. You need to start out with the correct marcflavour. It affects everything else, like what MARC Frameworks you have installed. You probably should reinstall a new Koha w/ the correct format.
I have set no zebra. since I'm not using millions of records. I'm doing a sample.
Zebra is still better, even if you only have 2 records. Since you would be reinstalling anyway, you might consider using zebra. If it presents difficulty to install it, then you can stick with nozebra.
How to do cataloging. How to add the books to the library. IS there any sample file provided. I'm a techie ,totally ignorant of library systems, isbn etc. I would like to add some 50 books to the library . How should i do it?
Please avoid crossposting on both the koha and koha-devel lists. Pick one or the other. For your other basic usage questions, please refer to the manual: http://koha.org/documentation/manual -- Joe Atzberger LibLime - Open Source Library Solutions