The first thing you want to use is LWP::Simple. If you're just trying to download a page and extract text then something like this should get you started:

use strict;
use LWP::Simple;
use HTML::TokeParser;

my ($filename, $results);

$results = get('http://[whatever website you want to grab]');

open FH, ">$filename"; # or whatever you want to call your file
print FH, $results;
close FH;

my $stream = HTML::TokeParser->new($filename)
  || die "Couldn't read HTML file $filename: $!";

while(my $token = $stream->get_token) {

# check for your information here

# This is from a token parser I wrote to parse web pages.
# Hopefully it will get you going
# 
# The S token is a start tag, and the if function returns 
# the data associated with the tag.
#
# if ($token->[0] eq "S"){
#     print "Token:S 1:$token->[1]\n";
#     foreach my $key(keys %{$token->[2]}){
#         print "Key: $key Value: #${$token->[2]}{$key}\n";
#     }
# print "3: @{$token->[3]}\n4: $token->[4]\n\n";
      }
}
[download]

That should at least get you on the road to what you're after.

Good luck!