use CGI related modules;
use HTML::Template;
use DBI;
use Myapp::Authenticate qw(authenticate);
use Myapp::View qw(view);
use Myapp::Update qw(update);
#
# you get the picture

##</code><code>##

# 1. create objects in the main script and pass them around
my $cgi  = new CGI::Simple;

# unpack $cgi minimally to determine what to do
my $action = $cgi->param('action');

my $dbh = DBI->connect(dbi stuff);
my $template = HTML::Template->new(logic to determine template);

# dispatch
if ($action eq 'view') {
  view($cgi, $dbh, $template);
} elsif ($action eq 'save') {
  save($cgi, $dbh, $template);
} yadda yadda

# then unpack the objects in the respective modules as needed

#--------------------------------------
# 2. don't schlep the objects, but refer to them via fully
# qualified names as needed
#
# create objects as above. unpack $cgi minimally to determine action

# dispatch
if ($action eq 'view') {
  view();
} elsif ($action eq 'save') {
  save();
} yadda yadda

# then, in my modules
package Myapp::View;

sub view {
  my $target = $main::cgi->param('target');
  my $this   = $main::cgi->param('this');
  my $that   = $main::cgi->param('that');

  my $sth = $main::dbh->prepare(...);
  $sth->execute;
  
  $main::template->param(RESULTS => $sth->fetchall_arrayref({}),);
}

#--------------------------------------
# 3. another variation
# besides any mix of the above, don't import/export anything.
# Refer to everything using their long names.