WELCOME TO GODHOOD.
You make the rules, draw the maps, control the characters, and decide exactly what color the sky will be. There are as many ways to build worlds as there are worlds to build. Which is to say: infinite. That will either scare the pants off you or set your mouth watering and your fingers twitching.
Put on your god-pants and get ready to write.
In this class, you'll learn different ways to approach worldbuilding, and how to insure that the world and characters you've created are so real, rich, and strong that they'll suck the reader in from the first page and keep them hungry for more. After all, there's a reason people go to the trouble to learn Klingon or Elvish.
Find out more and register at the LitReactor site.