Bethesda finally released the Skyrim Creation Kit today 07 February 2012 , so you can unleash your modder inside you ! Here is the quote from Bethblog :
Modders rejoice! We’re pleased to announce that the Skyrim Creation Kit is now available!
With the Creation Kit’s release, fans can now upload, download, and install custom content through the Skyrim Workshop on Steam. Get a crash course by reading level designer Joel Burgess’ blog post, and be sure to read up on our list of best practices for modding. Need more help? Don’t forget to to check out the official Wiki at www.CreationKit.com. In the coming days and weeks, we’ll be sharing tutorial videos for beginners and experts alike. Check out the first tutorial above, and visit the Bethesda Game Studios YouTube Channel for more.
In addition , Bethesda released an introduction in Skyrim’s modding with this Creation Kit video tutorial for beginners.