You could also read some of the new free eBooks about the tools around DB2, such as DataStudio, Data Architect, Developing in DB2, pure Query, and other ones. The books are at https://www.ibm.com/developerworks/w...us/FREE+eBooks
(FREE eBooks - Wikis
These books will help you to have an idea about the DB2 environment, how can you use it, and other possibilies with this database.
Just a database is nothing, you have to have applications, programs, users, etc., in order to understand and learn how to admin a database.