The obviouis answer is that you need WWW::Mechanize to get the html, submit the form etc.

But then you need to find the right links, etc. I recommend you also look at HTML::Tree which makes light work of plucking the right bits out of a complex html document. Don't be scared if it seems complex - it's really a quite simple matter of parsing the html, and using

my @bullets = $tree->look_down('_tag', 'li');
map { print $_->as_text; } @bullets;
[download]

or something along those lines...