Bundle::Bugzilla package is a bundle of the modules required for Bugzilla.
perl -MCPAN -e 'install Bundle::Bugzilla'
After installing this bundle, it is recommended that you run the magic checksetup.pl script to check that all modules are in place and setup the tables in the database. Then, you will need to edit the file called 'localconfig' with your settings. After this, log in to your installation and make yourself an account. Run checksetup.pl again and you will become the superuser for your bugzilla installation.
Still confused? Read the information in the docs/ directory in the Bugzilla distribution for more information on the installation process.