Can anyone explain in layman's terms what a layman needs to do to a DS to make it 'Work'.

I've just ordered one of these for my sons 4th birthday as the price seemed decent and he'll know doubt be into one sooner or later!

http://www.amazon.co.uk/gp/product/B006YUX7NW

I wondered if someone quickly explain what I need to do to unlock. The DS comes with a 2gb card and I plan to try and get hold of Mario Party: Island Tour for him and put this on the card for starters.

Any help would be great.

Many thanks,

Devs.