There seems to be a plethora of websites giving information on Chinmaya Mission. Which is the one I should rely upon?

The official website of Central Chinmaya Mission Trust(CCMT) is www.chinmayamission.com. Regional or Local Centres/Projects often have their own local websites. These may be center/ city/ country/ region specific. You may sometimes find more detailed information in a local website. We would recommend visiting the CCMT website mentioned here as also the local one pertaining to your area to get more detailed information.