A quick WordPress "Tools" menu option to Save the Values and Do the Thing.

gistfile1.txt

class THING_DOER
{
    /**
     * Holds the values to be used in the fields callbacks
     */
    private $option_name;
    private $page_name;
    private $options;
    private $action;

    /**
     * Start up
     */
    public function __construct()
    {
    	$this->action = 'do_it_now';
    	$this->option_name = 'thing_doer_option';
        $this->page_name = 'do-the-thing';
        add_action( 'admin_menu', array( $this, 'add_plugin_page' ) );
        add_action( 'admin_init', array( $this, 'page_init' ) );
    }

    /**
     * Add options page
     */
    public function add_plugin_page()
    {

        // This page will be under "Settings"
        add_management_page(
            'Thing Doer', 
            'Do the Thing', 
            'manage_options', 
            $this->page_name, 
            array( $this, 'create_admin_page' )
        );
    }

    /**
     * Options page callback
     */
    public function create_admin_page()
    {
        // Set class property
        $this->options = get_option( $this->option_name );

		if (isset($_POST['submit'])) {
			if ( ! wp_verify_nonce( $_POST[ $this->option_name . '_nonce' ], $this->action ) )
				die( '<h1>Invalid nonce.</h1><br/>' . var_export( $_POST, true ) );
			$optstr = $_POST[$this->option_name];
			update_option( $this->option_name, $optstr);
		?>
		<div class="updated"><p><strong><?php _e('Options saved.', 'mt_trans_domain' ); ?></strong></p></div>
		<?php  
        	$this->options = get_option( $this->option_name );
        	$this->do_it_now();
		} 

      ?>
        <div class="wrap">
            <h1>Gonna Do a Thing</h1>
  			<form method="post" name="options" target="_self">
	            <input type="hidden" name="action" value="<?php echo $this->action; ?>">
	            <?php wp_nonce_field( $this->action, $this->option_name . '_nonce', FALSE ); ?>
            	<?php
                // This prints out all hidden setting fields
                settings_fields( 'do_the_thing_group' );
                do_settings_sections( 'my-setting-admin' );
                submit_button( 'Do the Thing Now' );
            ?>
            </form>
        </div>
        <?php
    }

    /**
     * Register and add settings
     */
    public function page_init()
    {        
        register_setting(
            'do_the_thing_group', // Option group
            $this->option_name, // Option name
            array( $this, 'sanitize' ) // Sanitize
        );

        add_settings_section(
            'setting_section_id', // ID
            'Get-R-Done', //
            array( $this, 'print_section_info' ), // Callback
            'my-setting-admin' // Page
        );  

        add_settings_field(
            'thing_doer_field_one', // ID
            'Field 1', // thing_doer_field_two 
            array( $this, 'field_one_callback' ), // Callback
            'my-setting-admin', // Page
            'setting_section_id' // Section           
        );      

        add_settings_field(
            'thing_doer_field_two', 
            'Field 2', 
            array( $this, 'field_two_callback' ), 
            'my-setting-admin', 
            'setting_section_id'
        );      
    }

    /**
     * Sanitize each setting field as needed
     *
     * @param array $input Contains all settings fields as array keys
     */
    public function sanitize( $input )
    {
        $new_input = array();
        if( isset( $input['thing_doer_field_one'] ) )
            $new_input['thing_doer_field_one'] = absint( $input['thing_doer_field_one'] );

        if( isset( $input['thing_doer_field_two'] ) )
            $new_input['thing_doer_field_two'] = sanitize_text_field( $input['thing_doer_field_two'] );

        return $new_input;
    }

    /** 
     * Print the Section text
     */
    public function print_section_info()
    {
        print 'Enter the stuff needed to do the thing:';
    }

    /** 
     * Get the settings option array and print one of its values
     */
    public function field_one_callback()
    {
        printf(
            '<input type="text" id="thing_doer_field_one" name="' . esc_attr( $this->option_name ) . '[thing_doer_field_one]" value="%s" />',
            isset( $this->options['thing_doer_field_one'] ) ? esc_attr( $this->options['thing_doer_field_one']) : ''
        );
    }

    /** 
     * Get the settings option array and print one of its values
     */
    public function field_two_callback()
    {
        printf(
            '<input type="text" id="thing_doer_field_two" name="' . esc_attr( $this->option_name ) . '[thing_doer_field_two]" value="%s" />',
            isset( $this->options['thing_doer_field_two'] ) ? esc_attr( $this->options['thing_doer_field_two']) : ''
        );
    }

    public function do_it_now() {

    }
}

if( is_admin() )
    $thing_doer = new THING_DOER();