Ok I want to get an Xbox 360 Elite, and I already have a list of games I want to buy, games I want to download, and DLC's that I want to add on to my games.

BUT HOW EXACTLY DO ADD-ONS WORK AND I DONT MEAN MAP PACKS.

What I am talking about is stuff like GTA IV: Lost and Damned, and Fallout 3:The Pitt, and Fallout 3:Broken Steel.

Like does the game update when I start the game or what?
Please help me if you wanna see me on LIVE this Summer

Youcant play when its downloaded, wait tillit gets done, when it does and you start up your game it should work fine