Jade,
You don't have to pay anything to get your full driving licence when you pass. However when you first apply for a provisional driving licence, you need to pay £50 to get it (it's green in colour) and when you pass your test, they
automatically upgrade it to the full licence for free (this one is pink) and you will usually get it within a week. The driving examiner will do the necessary arrangements for you (informing the DVLA that you've
passed your driving test and they in turn will issue you with a new one), so you just really need to work on passing the driving test.
The DVLA website will show you
updated fees of driving licences.