If you want to perform the install and configure yourself, you can download Cloudera Express 4 and follow the install instructions for that. Or you can even try our Cloudera Enterprise 5 Beta 2 version if you would like to test the beta release.
If you would like to just have a pre-packaged, working, single node hadoop cluster to test things on, we also offer the Quickstart VM.
HTH,
Clint