อยากทราบวิธีการสร้าง Login & Password อยากทราบวิธีการสร้าง Login & Password โดยต้องการให้ครั้งแรกเข้ามามี

<?
$objConnect = mysql_connect("localhost","root","root") or die("Error Connect to Database");
$objDB = mysql_select_db("mydatabase");
$strSQL = "SELECT * FROM customer WHERE CustomerID != '".$_POST["txtCustomerID"]."' ";
$objQuery = mysql_query($strSQL);
$objResult = mysql_fetch_array($objQuery);
if($objResult)
{
echo "CustomerID already exist.";
}
else
{

$strSQL = "";
$strSQL = "INSERT INTO customer ";
$strSQL .="(CustomerID,Name,Email,CountryCode,Budget,Used) ";
$strSQL .="VALUES ";
$strSQL .="('".$_POST["txtCustomerID"]."','".$_POST["txtName"]."','".$_POST["txtEmail"]."' ";
$strSQL .=",'".$_POST["txtCountryCode"]."','".$_POST["txtBudget"]."','".$_POST["txtUsed"]."') ";
$objQuery = mysql_query($strSQL);
if($objQuery)
{
echo "Save Done.";
}
else
{
echo "Error Save [".$strSQL."]";
}
}
mysql_close($objConnect);
?>

<?
	session_start();
	if($_SESSION['UserID'] == "")
	{
		echo "Please Login!";
		exit();
	}
	mysql_connect("localhost","root","root");
	mysql_select_db("mydatabase");
	
	if($_POST["txtPassword"] != $_POST["txtConPassword"])
	{
		echo "Password not Match!";
		exit();
	}
	$strSQL = "UPDATE member SET Username = '".trim($_POST['txtPassword'])."' 
	,Name = '".trim($_POST['txtName'])."' WHERE UserID = '".$_SESSION["UserID"]."' ";
	$objQuery = mysql_query($strSQL);
	
	echo "Save Completed!<br>";		
	
	if($_SESSION["Status"] == "ADMIN")
	{
		echo "<br> Go to <a href='admin_page.php'>Admin page</a>";
	}
	else
	{
		echo "<br> Go to <a href='user_page.php'>User page</a>";
	}
	
	mysql_close();
?>