Re: Creating my own fantasy World
Generally, I will start with the myth (usually the creation myth) and move on (downwards in detail) to there.
What I usually do is have some basic things that I want to make sure get incorporated, or to find reasons for... and then set up the myths to explain them, and let the telling of the myth fill in the other pieces as it gets told. In a way, it's a bit like drawing the map first and then confining yourself to using what you've drawn, but in this case, instead of drawing a physical map of the world, I'm drawing a metaphorical map of the reasons FOR the world.
An example of how I do it is here.