Apply for a provisional licence; it takes about 2 weeks to arrive. Once you obtain this, you can have driving lessons until you/ your instructor feels ready to take your driving test - the practical test. Before, you take the practical test, you must have taken (and obviously passed) the theory test - although, it's not difficult, I'd recommend revising first; there are plenty of resources available to do so: books, CDs etc. After you pass your practical test, you're good to go! (providing you have a car and car insurance :P).
PS. Apologies if this has already been said, I haven't read the comments above.