Forum:Worldchampionship 2008 for DS

Well hello guys, im new to yugioh, I havent played since a long time ago ( when a ban list didnt exist ) I was wondering,

Should I buy the 2008 DS game to start playing again and to learn to play the game etc ?

Also is anyone kind enough to let me know with cards are missing ? thanks in advance

Is the AI strong in the game, or will i make short work of it ?

and last, is the wifi duels worth it ?