Your an amazing 15 year old firstly, most people your age are too busy chasing down girls or glued to the playstations and xbox. I have nothing against it but your level of thought and your passion for progression is fantastic in this day and age. I understand that school can be hard, i worked in education for 10 years in the UK and it was not fun at all. All i can say to you is, do the baby pips course first, you will discover some of the errors you will be making. Take your time and please feel free to make mistakes, remember little darling, F.A.I.L stands for FIRST ATTEMPT IN LEARNING. I dont know you but all i can say is i am a mother and i am proud of you. Keep going stay focused and you will find your way.
PS: Open a demo account it allows you to make mistakes safely its the same as live account and you can go crazy here with making mistakes. Remember the more mistakes you make the faster you will learn what works and what does not.
Keep going your fantastic!