First and foremost: if you are stumped with a question about reveal-ck, send me an email.
Second, if you have a specific question check out the FAQ.
Third, if you're comfortable with Cucumber and Gherkin, you can read through reveal-ck specifics in the documentation on relishapp.com.
People who've had the most success with reveal-ck start writing slides in Markdown. You can create all sorts of presentations this way.
If you're looking to get "more advanced," try adding snippets of bare Html to the Markdown presentations that you've created.
If you get into making slides you'll want to make use of reveal.js's classes and data attributes. Now's a good time to move onto the more complex html generation language languages.
Finally, there are a category of slides that are generated. These comes from sources like database queries and network calls. This is when you should learn about making slides with Ruby.