I was diagnosed at 15 and started learning to drive at 18-19. You're best off mentioning you're a type 1 diabetic to any potential driving instructor as they may or may not let you drive with them.
Before driving, try make sure your blood sugar is above 5mmol/L, you can still drive below this but it is recommended to be above 5. Take any hypo treatment with you and your blood checker. On my 2 hour lessons I asked if it was ok to take a break after 1 hour to test my sugars, you don't have to, but it was a precaution I took for both my safety and that of the instructor.
Other than that driving is very much the same when you pass. Inform the DVLA you are a type 1 diabetic when applying for your drivers licence. Once you have your full licence you will be required to renew it every 3 years as a diabetic, this may have changed to yearly recently I am not sure. As a none diabetic would, take regular breaks, and test sugars in safe areas and test your sugars before driving. If you feel like you are going Hypo, indicate to the driving instructor and pull over safely to test your sugars. This should not annoy instructors as long as you tell them your needs before taking lessons with them, so they can adapt to your needs, and understand why you need to do it.
Good luck