First thing you need is a provisional licence. You can apply for your provisional aged 15 years and 9 months. Some people might like to do this to drive a tractor. Also you can book your test for your 17th birthday when you apply for it early. (only joking who wants to sit a test on their birthday) This costs £34 online or £43 and you can get an application form from the post office.
On your first lesson you will need to produce your provisional licence and I will check your eye sight meets the required standard by reading a No. plate from a distance of 20.5 metres (67 feet). If you cannot read the No. plate will I recommended you see an optician .