Hi Beja,
Require:Java 7 update 6+. Java 7 update 51 is the latest(Java 7) version, should work as well.
JavaFx is inclueded in Java 7 update 6+ (JDK or Jre ),you don't need to install it seperately.
For development, you need JDK(not Jre).
JavaFX Scene Builder 1.1 should be installed as instructed.
bz