For the complete rulebook, refer to here:
http://www.clanwebsite.org/games/rpg/Dawn_of_Worlds_game_1_0Final.pdf
http://www.clanwebsite.org/games/rpg/Dawn_of_Worlds_game_1_0Final.pdf
This is a useful resource to refer to for figuring out how much points it'll cost to take an action. Other than that, you don't really need to read it as the premise of the game is very simple.
At the beginning of their turn, each player rolls 2d6 to work out how many points they've collected that turn (and initially to work out turn order). Then, based on the amount of the points they have available, they can take a number of god-like actions on the world which they do alongside a written roleplay post describing their actions.
For example, I might roll an 11, and then decide to use 9 of those points to Shape Land x3 and erect a mountain range. If I have points saved up from a previous turn, I might even have enough to create a race or influence an existing one.
The amount of points an action takes (and the kind of actions able to be taken ICly) depend on what age the world is in. Each age lasts a number of years/turns agreed upon by the players and encapsulates some theme; the first age is the age of shaping where there is rarely any life and the gods are most active moulding the world and planning, the second age is the age of ancients, where primitive life begins and the earliest seeds of divine influence are sown... and so on.
At the end of every turn, the changes carried out by the players on the world are recorded in two ways:
(1). Visual changes such as geography, cities etc. are recorded on a map drawn by me. This map starts as a mostly blank canvas (some fairly featureless continents) and is up to the players to populate and exploit.
(2). Lore changes such as races, creatures, organisations, technologies and so forth are recorded in an encyclopaedia thread that is kept updated.
To give an example of both:
Map from our last game - https://docs.google.com/drawings/d/16M1tFha1tq5xLMYkmVFHBF0Pr2WB-aXyPKWZRlJaWbo/edit
Encyclopaedia from our last game - https://docs.google.com/document/d/1RtW6Y80tUznirTHHkqlYIhueNzwdwKWbiW4g9K96Um4/edit
Those were games that ended relatively prematurely... and already we had a substantially changed map (someone ate the sun) and were filling out the lore.
That pretty much covers it, anyway. Hit me up if there are any questions.