>>33488418First don't open packs if you don't even have a playable deck. 2nd, focus on what kind of deck you want to make. Psychic? espeon/garb. Grass? Tapu bulu GX or Golisopod GX. Fire? Volcanion ex with some/any combination of baby volcanion/turtonator GX/ Ho-oh gx/Salazzle GX.
Now volcanion ex is 1 Guardians for the promo or regular art. Make your own public trade, then play the waiting game. when you make trades do small offers, like 1 guardians for 1 volcanion ex. if you do 3 guardians for 3 volcanion your chances of success go down severely since many players have 1 volcanion, but many dont have more than 1. Now you will see many decks use Tapu Lele GX, this card is expensive, you can pick it up for 25 Guardians Rising occasionally. The focus of 4 ultra ball, 2 Tapu lele and 2 Kiawe is to charge up your fire pokemon turn 1, then start sweeping on your next turn. The volcanion deck doesnt need tapu lele if you want to play budget, but eventually you want to get 2 at least for all other decks.
You can also use pikachu packs in the game shop which are 55 tokens, trade them for trainers like. 1 pika for 2 N.1 pika for 2 choice band. 1 pika for 2 fury belt. trade for the newest sets, non foil versions. Other than that you are off to a solid start, you can get tapu lele gx and build most standard decks.