First rule - before you do any serious training, obtain a class 1 medical - plenty of time for that because you can do a private pilot's licence meanwhile as a stepping stone. You don't have to be 19 to get one. By the time you finish training you should be somewhere near the minimum age for a PPL. Without a class 1 medical, all the training in the world is useless. You only need a Class 2 medical for a PPL, which can be upgraded later.
There are two types of training, integrated (mentioned above) which is a package deal in that you can walk off the street with zero qualifications and end up as a commercial pilot. Then there's modular where you can pick and choose your training providers, the first step into which is the PPL mentioned above. You have to study for 13 exams and do the flying training. You can do both at the same time, but you can't take the final flying test until you have passed all the written exams. Which leads me to the second rule - don't pay any money up front for anything - at least, not more than you can afford to lose. There are sharks out there, just as there are in any other business (and this is a business decision, for which it is a good idea not to be an aviation nerd, so you can take a step back).
At least with the modular route you get a piece of paper entitling you to fly at a very early stage, whereas the integrated onlygets you that at the end of the course, assuming you pass it. Also, you get to see if flying likes you as well as the other way round. I would probably in your case pop along to the nearest flying club and get to know one or two people there. You will likely find them very friendly.