After a little urgin gfrom Valadarr I've put togther a short article detailing how to organize your campaign on a compuiter to make finding notes and key images a breeze to show the players or print for handouts as desired.
At regular intervals, a god takes control of your world's weather. Choose the gods at random each turn of the interval and begin applying their effects subtly. Their power will depend on the strength of those who worship them.
For civilised people, worship of a god actually wanes during that god's month in an effort to reduce their potential destructive effect.