The reveal of the debut of Pokmon TCG God Packs shook the Pokmon TCG community to its core, leading to massive sales of Tag All Stars [SM12a] booster packs and boxes in the immediate weeks following its release
While I'll go over deck building in its entirety in another piece, right now, I'll suggest that for your first few times playing, you try out one of the pre-made decks the game provides
Dragons Exalted Pokemon cards can be a solid investment, especially rare cards in mint condition
Mox Opal needs you to be all-in on artifacts (or equipment), and running artifact lands
While you could use a custom deck you've built in these, the Story Decks are still a good option, and they recreate the duels from the anime
In my mind the original dark and gothic set was the set you designed, "The Dark." How did you end up as the designer for the set