I got the result. I need to create sale.order then after add the product to the sale.order.line using order ID

Here is the updated code.

require_once('ripcord/ripcord.php');

// Login to the account

$common = ripcord::client($url.'/xmlrpc/2/common');

$uid = $common->authenticate($db, $username, $password, array());

$models = ripcord::client("$url/xmlrpc/2/object");

// Creating the Quotation

 $id = 7; // Customer ID

$order_line = $models->execute_kw($db, $uid, $password,

    'sale.order', 'create',

    array(array('partner_id'=> $id,

            'product_id'=> 30,

            'name'=>'Hello2',

                'payment_term' => 1,    //immediate payment

               // 'medium_id' => 1

                )));

echo 'created new sale order with id:' . $order_line;

$id2 = $order_line;

$order_line2 = $models->execute_kw($db, $uid, $password,

    'sale.order.line', 'create',

    array(array('order_id'=> $id2,

            'product_id'=> 1,

            'name'=>'ABCD Product', //Quotation No. will relaced by the name (Quotation Name)//

            'product_uom_qty'=>10,

                'price_unit'=>300,

                'price_total'=>3000,

                )));

echo 'created new sale order line with id:' . $order_line2;