try http://www.ee.surrey.ac.uk/Contrib/manx/famhist/genealgy/refs.htm
for addresses - you want civil registry
(they may be on email at civil@registry.gov.im but I've not tried this route - the cert will cost about 5pounds - they were talking about accepting credit cards but again not sure - dont forget this week is TT week and the Island is basically shut down
Frances