Please don't! As a noob, I'd rather you specifically use sudo each time. This will keep you from seriously mucking things up by accident.small tip to save repetitive password entry (root level access for session)
sudo -s
password again and your in as root
the its apt-get (whatever-you need-to-do/install) for the session
FYI: sudo makes you a temporary "super user" so that you can make administrator changes to the OS. Otherwise, all commands are run as a lowly user -- and only changes to your own files and settings are possible.
Even I don't use sudo -s (or sudo su).