Grand Prix

Hi guys. I'm relatively new on magic but i love the game and many ppl fron my local meta had told me that i'm very good at this and i think i have a very good knowledge of the game because i got pretty serious on this when i started to play.

I'm planning to play on the next GP Barcelona. I wanted to ask some tips for a first time gp player.

Also, i've won many tournaments on local with a gb elves deck. Jund, zoo, jeskai and wu control, infect, dredge and tron i've faced the most and i'm pretty confident on this matchups. But i don't really know what to expect on a gp. In order to make my side, i have to know a least a little.

Also. My decks has no fetch lands. Do fetchlands make the diference? I want to maximisize the deck.