"How about a teen sex romp where you and your buddies are always trying to get some!" - Homer, The Simpsons
By the way I'm writing a movie, it takes place in a galaxy far, far away, where laser swords are used and samurai-like protectors are killed off to the point of near extinction. I'm thinking about calling it, Space Skirmishes...what do you think...
Seriously, your idea is Harry Potter with a new title, which isn't even posted here yet. Using the idea of a child who can do magic isn't the same, but if you have a school and stuff, you're gonna make too much of an homage to it and it'll be shot down by everyone. My advice, take the 3 basic concepts you want, ie, magical powers, child as main character, and whatever else you want, let's just fill it in now with "boy has a destiny". Then set your story in some place different than Hogwarts, and start from there, with a few characters and such, then build the story. Don't start by wanting to make a Harry Potter book, start by wanting to make a "Insert Title Here" book.