1) In the admin panel, have you set the CC or BCC options to send a copy of the reciept to the shop owner? Is the customer getting the email?
If the customer is getting the email, you should contact the host to have them look into the smtp server error logs to see why the email is not being relayed to the shop owner.
2) the code that displays the ID will look like:
<?php echo $WA_Store_Cart->DisplayInfo("ID"); ?>
you can replace that with:
<?php echo $WA_Store_Cart->DisplayInfo("SKU"); ?>
to display the SKU number where you would prefer to see the SKu in place of the id.
3) The checkout form in the cart will not allow you to checkout if you do not enter a phone number, this is already mandatory on the checkout form.