try{
    //configure the collection filters.
    $collection = Mage::getResourceModel('customer/customer_collection')
    ->addAttributeToSelect('entity_id')
    ->addAttributeToSelect('firstname')
    ->addAttributeToSelect('email');

    //Add a page size to the result set.
    $collection->setPageSize(50);
    //discover how many page the result will be.
    $pages = $collection->getLastPageNumber();
    $currentPage = 1;
    //This is the file to append the output to.
    $fp = fopen('customers.csv', 'w');
    $addedKeys = false;
    do{
         //Tell the collection which page to load.
         $collection->setCurPage($currentPage);
         $collection->load();
         foreach ($collection as $customer){
            $customerArray = $customer->toArray();

  $newordercollection = Mage::getModel("sales/order")->getCollection()->addFieldToFilter('customer_id',$customerArray['entity_id']);
  $collection->setOrder('entity_id', 'ASC');
  $firstItem = $newordercollection->getFirstItem();
  $orderID = $firstItem->getIncrementId();

            //write the collection array as a CSV.

            $customerREquiredArray['customer ID'] = $customerArray['entity_id'];
            $customerREquiredArray['First name'] = $customerArray['firstname'];
            $customerREquiredArray['Email'] = $customerArray['email'];
            $customerREquiredArray['order id']= $orderID;

$orderdate = $firstItem->getCreatedAtStoreDate()->toString(Varien_Date::DATETIME_INTERNAL_FORMAT);

$orderdate = var_dump($newordercollection->getCreatedAt());