All United States Kendo Federation has an interesting post about how and what to study to become a good Kendoka. The guide can be found at http://www.auskf.info/docs/studyguide.htm.
The best Kata guide we recommend to our students is the official video from All Japan Kendo Federation on Youtube: https://www.youtube.com/watch?v=OMyuTsE1hl4
Good luck with your Kendo endeavors!
~GSKC