This will be quick. I just read a great article on a website I visit called SixPrizes (SixPrizes.com), which is a web site devoted to posting good Pokemon TCG strategy articles. The article was labeled "Tools of the Trade" and discussed the various different items new players need (or want) in order to play the game.
Check it out!
If you have any questions on how to acquire some of these items, ask one of the league helpers at league and we'll try to answer any questions you have. Some items are easier to get than others.
Thanks for reading!