Help needed about buildings in EU3

[Babri]

So I am playing Divine Wind these days and had some confusions regarding buildings.
1) The buildings in trade category say that they improve local trade efficiency etc, does that only effect the value they contribute to the CoT or also the Production/Tariff income ?
2) What buildings should I build in my colonies ?
3) Constructing temples provides a fixed stability modifier so does that matter where I build it ?

[Babri]

Still waiting for replies.