Any tips on motorcycles? NOT *Harleys/Choppers* I'm talking about Suzuki's, Kawasaki's. Racing motorcycles.?

So, I'm 14. I know I'm young, but I want a motorcycle when I'm 16. I have 2 years before I hit 16, for my permit. I know when you get your permit you can ride by yourself but anyways! Can anyone give me tips on buying on good helmets? Price ranges? All that stuff. Please & Thank you. :)