If you want to learn python, there is a tutorial for pong here:
http://www.linuxuser.co.uk/tutorials/ma ... spberry-pi
I haven't quite read through it, but a few quick searches on Google aboutpython and you sshould be able to do it. Alternatively you could use scratch if this is your first time programming
http://www.teach-ict.com/ks3/djp/scratc ... 0GAME.pptx
Again, I haven't read it, but it should work.