I have no idea what I'm doing!
Don't worry; you're not alone! ;-)
Hit the Help System for certain, and look at the Games help under the GM Menu, Game Access Levels, and Game Groups. You'll find a lot of powerful tools are available to a GM for organizing campaign and world-building data.
While you're at it, if you intend to run a game with Mature or Adult policies, definitely read up on the Site Policies. (You might want to do that, anyway.)
There's lots to see and do here, and lots of friendly folks who want to help you have all that fun.
When you think about, post an intro in Beginners if you haven't already, and look at Game Proposals, Input, and Advice. That's the place to float a proposal and gauge interest for a game concept before you put a lot of work into it.
Like I already said, there's lots to see and do. May the dice always treat you gently.