Any advice on how I actually install Selenium core on Ubuntu?
There really isn't anything to install. You just download the jar files and run them. Looking at the error message you got, I would guess you don't have Java installed. You need to install Java to run Selenium. WWW::Selenium is a perl interface to Selenium Remote Control only.
Did I get this code position correct?
Yes. You should always check the SYNOPSIS in TFM which shows you the typical usage.
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