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HI.
You can access 'www.upsc.gov.in' for details. The CS exam is a three stage exam divided into _Preleminary exam which is objective type and roughly ten times the candidates as per the vacanices are called for the second stage exam Mains which is descriptive type carrying 2000 marks and finally the interview of shortlisted candidates carrying 300 marks. The final merit list is prepared on the basis of total 2300 marks (2000 for Mains + 300 fr Interviews). Any leading book publisher in your area should be having the relevant books and study material required for preparing for the Civil Services. Further, it is the main text books of your Optional that are the most important for studying for the optional papers. If you still find it difficult to have adequate study material, try the option of enrolling for coaching through correspondence from some reputed Coaching Centers such as Brilliants. However, do keep in mind that there is no substitute for a planned, systemic preparation spanning 1-2 years for this prestigious exam. Also keep on applying for other exams such as PO exam conducted by various banks and RBI etc. so as to have a good practice and feel of the competitive exams.
Best of luck for your future.