Just follow the rules and get familiar with the decks in the format.
Be confident with your deck.Dont just build a deck because everybody is saying it is the best (im not saying that archetypes are bad).Build a deck with the pokemon you like and try to make the deck good. :D
I got a Jolteon ex when i bought to DS packs.
I also got a Swmpert ex when my mom bought me one booster pack from CG and the was the first booster i had or i bought in my whole life because i started playing cards only on November.
Things that matter for me are the release date of Power Keepers
Power Keepers will be on Feb 14, 2007
diamond and pearl for DS will be on april 22 2007
I dont know when the DP set for TCG will be released.
Well i believe that buying in the right place and at the right time gives you good cards.
I just bought 2 DS boosters a while ago and I got a Jolteon ex.When I also bought a CG pack (my mother bought me one) i got a Swampert ex.