My advice...save money and get to a league. With your money, find a simple deck online that isn't too much, and buy the singles on Ebay for it. Learn with it and test it around, until you accumulate more cards and learn the rules at the League and earn prizes, etc. Then you can also go to one of the City Championships that are currently going on when you think you're ready, or wait until the next tournaments are here if you don't think you are ready.
Takes time, but basically just:
1) Go to a weekly League/Tournament.
2) Save money.
3) Practice, practice, practice.
4) Read online what's going on.
5) Go to a tournament when you think you're ready.
Follow those steps and I assure you you'll get good in the tournament seen fairly quickly. Just remember, nothing is easy-even Pokemon.
Hope it helps.
Arcanine out.