You'll have an overdraft which will cost you, you will be charged daily for this until it is paid off as well as a fee for going into overdraft without permission...it varies but about ￡35.00 for the unauthorised overdraft and ￡5.00 a day for charges is usual.
The second thing you ordered will try to take payment from your bank account today or tomorrow and find nothing there so they will not release the goods till you pay for them again.
Your bank account will go into negative and you'll have outstanding debit. Also, depending on your bank they may charge bank fees for every consecutive days you're in debit until it is fixed.
how did you PAY for it, you NEED A DEBIT CARD
you cant get order something -with out debit card
