The best way to try out Spark & related tools is to follow the 2 days exercises from the AMP Camp 3, they have a script to launch the whole cluster (Berkeley Data Analytics Stack) on ec2 very easily so you can get your feet wet without too much effort.
[1] http://ampcamp.berkeley.edu/big-data-mini-course/
[2] http://ampcamp.berkeley.edu/big-data-mini-course/launching-a...