Help needed. Adding jQuery Multiselect to a new plugin

Dear all.

I’m not a coder. I know just a little of php and mysql. But i have some common understanding of things ??

For the plugin that i’m developing for my website (www.8ball.lu) i need to add jQuery Multiselect script (https://quasipartikel.at/multiselect).

Multiselect would be used in one page of plugin administration. But i am not able to make it work. I have read a lot of tutorials, saw a lot of examples, and nothing seems to work for me.

The lines, I have stopped at are (I am using absolute addresses for it to be clear now. Will change after):

wp_enqueue_script('jquery', 'https://www.8ball.lu/wp-content/plugins/billiards-manager/styles/jquery-1.3.2.min.js', array('jquery'), '1.3.2');
	wp_enqueue_script('jquery-ui-custom', 'https://www.8ball.lu/wp-content/plugins/billiards-manager/styles/jquery-ui-1.7.3.custom.min.js', array('jquery', 'jquery-ui-custom'));
	wp_enqueue_script('jquery-multiselect', 'https://www.8ball.lu/wp-content/plugins/billiards-manager/styles/ui.multiselect.js', array('jquery', 'jquery-ui-custom','jquery-multiselect'));
	wp_enqueue_style('multiselect-style', 'https://www.8ball.lu/wp-content/plugins/billiards-manager/styles/jquery-ui-1.7.1.custom.css');

The other problem is that i do not have clear idea, where to put these lines.
My main file contains:

add_action('admin_menu', 'billiards_admin_actions');
function billiards_admin_actions() {
	add_menu_page("Billiards Manager", "Billiards Manager", 1, "Billiards Manager", "billiards_about");
	add_submenu_page("Billiards Manager", "About BM", "About BM", 1, "Billiards Manager", "billiards_about");
	add_submenu_page("Billiards Manager", "Licenses", "Licenses", 1, "Licenses", "billiards_licenses_admin");
	add_submenu_page("Billiards Manager", "Clubs", "Clubs", 1, "Clubs", "billiards_clubs_admin");
	add_submenu_page("Billiards Manager", "Fixtures", "Fixtures", 1, "Fixtures", "fixtures_admin");
	add_submenu_page("Billiards Manager", "Billiard Manager Settings", "Settings", 1, "Settings", "billiards_settings");
	add_submenu_page("Billiards Manager", "Players", "Players", 1, "Players", "players");

}  

function billiards_about() {
echo '<div class=wrap>';
	include('admin/about.php');
echo '</div>';
	}

function billiards_licenses_admin() {
echo '<div class=wrap>';
	include('admin/licenses.php');
echo '</div>';
	}  

function billiards_settings() {
echo '<div class=wrap>';
	include('admin/settings.php');
echo '</div>';
}

function fixtures_admin() {
echo '<div class=wrap>';
	include('admin/fixtures.php');
echo '</div>';
}

function billiards_clubs_admin() {
echo '<div class=wrap>';
	include('admin/clubs.php');
echo '</div>';
}

function players() {
echo '<div class=wrap>';
	include('admin/players.php');
echo '</div>';
}

I want to use jquery Multiselect in the file players.php.

Please advise stupid me, what I am doing wrong ??