The loop starting at a certain ID

You can use posts_where hook to achieve this

add_filter( 'posts_where' , 'posts_where' );

function posts_where( $where ) {

    global $wpdb;

    $start = $query->get('ID_VARIABLE_HERE');
    // add any condition if you have
    if ( ! is_admin() && $query->is_main_query()){

        $where .= " AND {$wpdb->posts}.ID >= $start";
    }
    return $where;
}