So, From my personal experience I would say to practice 4 main skills : Accuracy, Flying, Dodging, and turning. For accuracy practice throwing the quaffle because soon you will get use to it and it will become light, eventually allowing you to aim easier. For flying time yourself flying around the Quidditch Pitch, improving your score works on your flying abilities and speed. Next, for Dodging have a friend, or sibling hit the Bulger at you and dodge if you get hit don't be afraid of trying again. "Try try and Try again". For turning fly your broom directly at the ground and at the last second pull up, also fly at a wall and at the last second steer left or right. Thanks for reading my book Don't Forget to Follow me , I put a lot of work in this book