Just bought my new sleeves yesterday. I'm going to PINK up my Nationals ;D (No, that wasn't a pun for stink. That's just nasty.)
Anyway, I always end up laughing every time I act like a noob. I guess I just try too hard. But I do know the noob way:
Clothes: Cheesy Pokemon shirt with Ash and/or Pikachu on it with bubble letters saying something like "WANNA BATTLE?!!?"
Stuff: Paper playmat, cardboard damage counters, a plastic Pokemon coin, cardboard deckbox OR rubber band. Regular Ultra Pro deckboxes work too. No sleeves, they are banned in the nooby way. If you have to have sleeves, pick a really bad quality blue sleeve.
Speech: "Oh, I forgot to pick my card," the most famous noob saying. Also, always remember to read the ENTIRE card text. Don't just say "Night Spear" say "Night Spear; Does 30 damage to one of your opponent's benched Pokemon. Don't apply weakness and resistance for benched Pokemon." Oh, and if you really are using Night spear, make Dark Claw and Special Dark count towards the bench, disagree until the judge comes over and tells you otherwise.