As an Employee, let me help you guys out. My store also had no idea what was happening (though we only had one touchpad preorder in store and it was a friend of mine, so I helped her personally)
If the employee doesn't know what's going on, this is the procedure:
There is a preorder form available. If they sign into the employee system they can simply type "touchpad" into the search box. The first result should be the PDF for the 16gb preorder. The second, 32gb. They are labeled obviously.
There is a Sku that says "preorder". They scan it, it says $50. When they hit total, it prompts to give a $50 gift card. They way it's supposed to work? Customer pays $50 and it goes onto gift card. Customer information is put onto the form. I made a copy and stapled a receipt to it, gave it to the client. Then the store is supposed to have a file on hand for when the day comes.
I'd suggest holding onto your receipt, though at the rate my store is going we should have plenty on hand.
I have heard we will have stock in hand on the first, though it's nothing 100% conclusive.