how i can add more required * fields in checkout page?

If you at least know how to open your “functions.php” file, the following should work if you simply add it at the bottom of your functions.php file of your (child-)theme:

// Hook in

add_filter( 'woocommerce_checkout_fields' , 'custom_add_checkout_fields' );

// Our hooked in function - $fields is passed via the filter!
function custom_add_checkout_fields( $fields ) {
     $fields['billing']['Company'] = array(
        'label'     => __('Company', 'woocommerce'),
    'placeholder'   => _x('Company Name', 'placeholder', 'woocommerce'),
    'required'  => true,
    'class'     => array('form-row-wide'),
    'clear'     => true
     );


    $fields['billing']['Position'] = array(
        'label'     => __('Position', 'woocommerce'),
    'placeholder'   => _x('Position', 'placeholder', 'woocommerce'),
    'required'  => true,
    'class'     => array('form-row-wide'),
    'clear'     => true
     );


     return $fields;
}

This should add the fields to the checkout page and have them be required. Then if you want to also add that information to the emails:

add_filter('woocommerce_email_order_meta_keys', 'my_custom_order_meta_keys');

function my_custom_order_meta_keys( $keys ) {
     $keys[] = 'Company'; // This will look for a custom field called 'Company' and add it to emails
     $keys[] = 'Position';
     return $keys;
}

Snippets used from this woocommerce doc

PLEASE NOTE

Adding this directly to your functions.php file of your theme and then updating your theme removes it – creating a child theme is best practice.
I know this whole answer might not help you, but it might help someone else.