Something like this standard code example should work:

#!/usr/bin/perl

use strict;
use Tk;

# @checkboxes is an array of two-element arrays, each of which
# provides a label in element 0 and a value in element 1.
# A reference to element 1 is given to the -variable option
# of Tk::Checkbutton.
my @checkboxes = (
['First Checkbox'  => 0],
['Second Checkbox' => 0],
['Third Checkbox'  => 0],
);
my $mw = tkinit;
MakeCBs($mw, 'Label:', @checkboxes);
$mw->Button(
    -text    => 'Print checkbox values',
    -command => sub {
foreach (@checkboxes) {printf "%s: %s\n", $$_[0], $$_[1]}
    },
)->pack;
MainLoop;

sub MakeCBs {
my ($w, $label, @cbs) = @_;

$w->Label(-text => $label)->pack(-side => 'left');
foreach (@cbs) {
    $w->Checkbutton(
-text     => $$_[0],
-variable => \$$_[1],
    )->pack(-anchor => 'w');
}
}
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