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Hey ther?! Depends on the requirements for your local tournament. Is it a proper ranked tournament? You may need to check KONAMI website for banned cards so the other players can't bann you while playing. Otherwise as long as your deck is clean go and have fun. You'll feel akward as you don't know anyone there but if you keep going to play you'll start to make friends and you can swap your cards for a better one. Have fun ;)

Just have fun if you're only there to win people probably won't like you so be yourself and kick some *** while you're at it just use the minimal amount of cards you can use in this tournament so you you have a higher percentage change to draw a good card also have a few trap card that can destroy a monster right away because if you don't and your opponent has a stronger monster on his field then you have in your deck you're screwed also pot of greed if you have it is awsome