Hi Soph,
I know you're enthusiastic to get going and it's all very exciting, but you really just need to take it steady a bit.
As your school will probably have told you, any flying training you do from 14 will count towards the requirements for licence issue, however you can only fly dual until you are 16, after which the solo hours can be flown, then you can take the skill test, but you cannot have a PPL until you become 17. So you are looking at between 2 and 3 minimum, before you even have a PPL. You can do all the syllabus exercises dual and pass the theory exams between now and becoming 16, then get a medical and do the 10 hours solo and LST, ready to have your PPL issued when you turn 17. However, this way of doing it will be more expensive than waiting until you are 16 and doing it in a more conventional order.
How then to progress from PPL to a professional licence? The answer this week, for someone who is 17 or 18 probably won't be the same as it will be for you in several years time. The "good" or "cheap" places to go now may not be the same in the future, they may not even exist anymore. The regulatory environment is also changing significantly over the next few years, that may change the options available to you.
So by all means continue for your PPL, but don't discount other types of aviation experience, as mentioned in previous posts, such as gliding and the ATC.