All can be found in the respective companies' websites, usually under investor relations link. Or you can go to the SGX corporate announcements page to look for the information.
You will not receive the annual reports and such, but then again you can look them up in the places in the previous paragraph above.
Not sure if we are on the same line, I'm aware that I can find those info from the respective companies. But these info only applies when I buy their shares by itself right? For example, DBS. What if I buy etf (and etf has DBS in it), DBS website won't state the dividend payout of the DBS under etf? Cos Perisher mentioned earlier than DBS under ETF dividend will be lower than DBS by itself?