extreme nubbie need help setting up hadoop

[bjday]

Good afternoon all,

I work tech and an extreme nubbie at hadoop.  I could sure use some 
help.  I have a professor wanting hadoop installed on multiple Linux 
computers in a lab.  The computers are running CentOS 5.  I know i have 
something configured wrong and am not sure where to go.  I am following 
the instructions at 
http://www.cs.brandeis.edu/~cs147a/lab/hadoop-cluster/   I get to the 
part Testing Your Hadoop Cluster but when i use the command "hadoop jar 
hadoop-*-examples.jar grep input output 'dfs[a-z.]+' "  It hangs.  Could 
anyone be kind enough to point me to a step by step instillation and 
configuration website?

Thank you
Brian