How to get to a 3x fire kings deck in the most efficient way

Hi, recently gotten into yugioh, me and friends bought a couple of the basic deck, and we now have all upgraded, me to firekings (bought 3). I wanted to practice this deck digitally first. But im a bit confused on how i would go about getting the cards i need. Already started doing the solo tutorials for gems and card, and learning all the stuff that wasnt in the first decks we played.

But i see that there is no fire kings constructed deck in the store, so what do i do now?