Start with the 1.7.x version.
2.x is not yet ready for production use esp for zwave. Close–but not yet.
See here for various Pi 2 etc noob info:
Read the whole thread.
You can do this. You just have to be systematic about it.
Get the binding loading first.
Change your logback.xml to do DEBUG logging of zwave.
@cdjackson (who has done heroic work on zwave) disagrees a bit, but others have found the same thing I have, sometimes you have to specify the :0 port in your zwave items file(s).
Get into the habit of defining PROXY’s for your items — it may seem superficial now, but get into the habit from the beginning of your journey here and it WILL keep your away from a host of logical/mental problems later.