On my first MacBook Pro, I bought what was then called the Mighty Mouse but found that I didn't use it much.
But, if you're going to use it for gaming I would take a look at the Magic Mouse (look here to see some of the comments - some good, some not so good) from users that have purchased it from Amazon. If you're a serious gamer you might want to look at some of the alternative mice, joysticks, etc., that are out there that will work with a Mac.
When (and I hope that it's soon) I get out of this nursing home, I'm hoping to get an Apple Thunderbolt Display and some sort of mouse and keyboard. And I'll be looking at the Magic Mouse and the Apple wireless keyboard as I've grown accustomed to having something that's not 'wired'.
Take a look at the comments and say what the Amazon users have to say and maybe look at the alternatives that they recommend.
Good luck in high school - READ!!!
Clinton