Ok... I have my own rules which I do never break. They are:
1) Never attack allies unless they do attack you first
2) Never attack non-ally countries first 100 turns unless they attack you first.
3) Never capture settlement which are not adjacent to yours. (apart from islands and they must be in your sphere of influence. so no ireland invasion as Venice.)
4) Never lower taxes in order to get population boom. (keep taxes at least on the level which makes population contended(yellow face) I decrease taxes to get population increase only in case where 15000 needed and I have 14870 or something like this in order to get promotion to the next level 1-2 trun earlier.
5) Construction is priority
This shall give you general idea how fast or slow I am....
