You may wish to start by browsing some of the new features the Creation Kit offers. If you're experienced in modding for Morrowind, Oblivion, Fallout 3 or Fallout: New Vegas, the Creation Kit will feel very familiar to you, as the data format and tools are shared between those games and the Creation Engine. Once you're comfortable with the tool and ready to get to work, try jumping into one of the tutorial projects on the right. You may also wish to browse the general editor reference pages to get an idea for some of the terminology and concepts used throughout this wiki.
If you're brand new to modding, or just brand new to modding for Bethesda Game Studios' titles, start here, where you'll get basic instructions for installing and navigating the Creation Kit. This tutorials section is designed to help you get started regardless of your level of experience and area of interest. Modding can be a complex and daunting prospect with any tool, and the Creation Kit is no exception.