Okay so now i am playing as Terra and i am going to disney town but how do i get the Winning Medallion Keyblade? the guide book said i get it by winning the Keyblade Minigame Race... but idk where that is?

I don't have the game, but why don't you try and search in Youtube for a video.

Here you go, I found this on Youtube:

 

(Part 1)

(Part 2)

(Part with the racing)

 

I put all three parts as it helps you all the way through Disney town. The last part i just the racing but I'd suggest starting at Part 2 as it leads you up to it =]

 

Hope this helps ^_^ (I also posted on your Ice-cream question a guide =])