Hi Neelam
Whatever zencart contribution add-on you use, you'll often end up needing to learn some of what to do from reading the appropriate forum thread, and even buying that zencart manual. Or you can ask for paid help in the forum section
for beginners its absolutely a good idea to install a test zencart, for experimenting. Go on..just upload the contrib files, apply the sql patch in zencart admin...You can always delete the cart and start again if you need to... its free :) it doesn't go bang.. its fun...(sometimes)
The book contribs should work out of the box provided you understand that many of the book fields values are not texted directly into the admin book product page, you choose there from preset options dropdown lists.. therefore you have to go populate the authors list at start separately, because the tables are created empty on installation of the add on. We don't know what authors you require.. or what book formats you have..
So for instance, add an author to the authors list table... then all the books can see that choice for author in book admin. This method moku chose because it enables selection of more than one author for any one book.
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