Hi Carlos!

I'm also really new to Cassandra but here are a couple of links that I found useful:
http://wiki.apache.org/cassandra/ClientExamples
http://arin.me/blog/wtf-is-a-supercolumn-cassandra-data-model

and one of the presentations like:
http://www.slideshare.net/jhammerb/data-presentations-cassandra-sigmod

Erik