M.J.
Amazon is actually really hard to buy Beyblades from. They mostly carry the Japanese versions - which are much more expensive. The popular ones that the kids are buying here are sold most places like Target, Walmart, TRU etc.. One bey should be closer to 8.99. You also want a Bey arena for the battles. You may be able to get a starter kit, I don't remember. We just bought all separately.
I have no idea what the point of playing with them at school is if you can't use a launcher?? Weird.
You and others count down 1 -2 let it rip, then pull the launcher and launch the bey into the arena with the others. The first to get knocked down is the looser. Then you keep doing it.
My son did not like the beywheels as much as the beyblades.
They are not a fighting toy and are totally appropriate for 5 year olds.
Here is an arena with 2 beys. http://www.toysrus.com/product/index.jsp?productId=111451...
An extra bey or a 2 or 3 pack
http://www.toysrus.com/product/index.jsp?productId=11745493
http://www.toysrus.com/product/index.jsp?productId=12475940