Welcome fluffy!
Uh oh you're hooked! there's nothing like that feeling when you spot another package in the mail!!
I'll echo what Don has said though, it is easy to get caught up in the rush of the latest "must have" decks, I have decks in my collection that I don't actually like (Propaganda as an example) though at the time it was the latest release from t11 so of course a must have I haven't bought any of the last releases from D&D, T11 or Ellusionist, but have backed many kickstarter projects.
You also don't need to buy 2 bricks of every release!!! What I'll say is collect what appeals to you and not what you or others think you should. Having said that try and get a Gold Arcane!!!
if you have any questions ask away, we're a friendly bunch honest, and there's some very knowledgeable folks around the boards
Collect what you love, Love what you collect
Enjoy your stay!!