Here is a official site of Cheif Electoral Commissioner Bangalore. You can get any information you need in it. Here are few direct links for some of the important information.
Official Site Home Page: http://www.ceokarnataka.kar.nic.in/hm_ec.aspx
FAQ related to Election and to add your name to electoral list: http://www.ceokarnataka.kar.nic.in/FAQsElectoralRolls_New.aspx
Other good site related to Election: https://www.nvsp.in/
Please locate the nearest Election Commission Office in your area here: (only for Bangalore) http://www.ceokarnataka.kar.nic.in/PDFS/B1CentersListforEPICService.pdf