If you are looking start your driving lessons beginner drivers will need to apply for a provisional licence from the DVLA.
Once you have that you and it is current you can start lessons.
You must be careful when choosing a driving instructor and consider many things such as gender, car type, availability and so on.
Driving lessons beginner drivers can be of any length of time, we would advise that you have a two hour lesson to start with as you will get much more covered and feel fantastic about what you have achieved.
Lear to drive with a professional instructor