create order - drupal commerce
Of course you can create custom order form and page in new custom module. I think you understand drupal 7 FORM API, so you have to create new page with form.
You can process form values (i mean in form submit funtion) using entity API.

To create an order for current user:

global $user;

$order = commerce_order_new($user-&gt;uid, $status = 'pendig', $type = 'commerce_order');
commerce_order_save($order);
$order_wrapper = entity_metadata_wrapper('commerce_order', $order);


To add billing info:

$profile = new stdClass();
$profile-&gt;type = 'billing';
$profile-&gt;uid = $user-&gt;uid;
$profile-&gt;status = '1';

$profile-&gt;commerce_customer_address['und'][0]['country'] = $your_country;
$profile-&gt;commerce_customer_address['und'][0]['locality'] =$your_locality;
$profile-&gt;commerce_customer_address['und'][0]['postal_code'] = $your_postal_code;
$profile-&gt;commerce_customer_address['und'][0]['thoroughfare'] = $address;
$profile-&gt;commerce_customer_address['und'][0]['first_name'] = $first_name;
$profile-&gt;commerce_customer_address['und'][0]['last_name'] = $last_name;

commerce_customer_profile_save($profile);

$order_wrapper-&gt;commerce_customer_billing = $profile-&gt;profile_id;


Then you can add products to this order:

Presume that $products is an array of arrays of products ids and quantity of this product user is buying (EG. 

$products = array(
array('product_id' =&gt; 22, 'quantity' =&gt; 1),
 array('product_id' =&gt; 23, 'quantity' =&gt; 3),
);

foreach ($products as $item) {
$product = commerce_product_load($item['product_id']);
$line_item = commerce_product_line_item_new($product, $item['quantity'], $order-&gt;order_id);
commerce_line_item_save($line_item);
$order_wrapper-&gt;commerce_line_items[] = $line_item;

}
//to save line items and billing info in your order
commerce_order_save($order);