It depends on the deck. Try to play Supporter/Draw cards and large Pokemon lines (3-2-3 with Rare Candy, 3-3-3 without, etc. with your lines) and support. Try to have a strategy. Also most people who start out, I advise the rule book's amounts of what to have. You know, 20/20/20 for each, until you start to get better and competitive and learn how to get everything situated to the appropriate lines for archetypes, or rogue decks.
You can learn most anything you need to know if you can get to a league or local tournament, and have people help you, as well.
Arcanine out.