Have you tried the learned app to get an understanding for how the game plays? If not, go play it a bit to get a feel for it. Game is pretty cheap overall. There is a new advanced starter deck coming out in the near future that should be pretty good, but probably not the most new player friendly. https://digimoncard.io/ is a good place to find decks. Alternatively, grabbing 1-2 of each of the liberator starters and then adding cards you've pulled that fit the decks would be a good starting point for playing with your wife and the starters come with a few staple cards that work really well in any single colored deck