StoryLab is a completely free tool for crafting gamebooks, Choose Your Own Adventure-style books and other interactive stories. We used it to make DestinyQuest Infinite. StoryLab is designed to be simple to use and easy to learn.
You can jump right in, learn more by watching text tutorials and videos, or visit our forums to ask a question.
Porpentine's tutorial covers both basics and more advanced information: http://aliendovecote.com/?page_id=4047
In addition, if you have questions, the forums are a fast place to get an answer to anything cow-related.
Yes, you can now publish your stories almost instantly through Adventure Cow. Try the Cow theme, available here.
You can also post a story hosted elsewhere as a link on Adventure Cow here.