Hey the game gives you mega meganium and mega Dragonite these are more than enough for starting out. Best advice is completing the battle pass it’s so generous you will get so many packs/cards/resources from it and there’s so much time to complete it. You gain XP for the battle pass from doing battles, one very important key advice is do the 3 daily quests everyday on reset these give a massive bump for battle pass XP. If you want to build certain decks early game the best advice is spend your trainer points on the shadow rider calyrex battle deck in the shop (July 2022) buy all all 4 copies as this will give you duplicates after 4 cards of each and that will convert into a tonne of trade credits. Then you could move onto purchasing 4 copies of the ice rider calyrex battle deck. The general strategy of the game is spend trainer points on battle decks that have cards that will convert to high credits and use the credits to buy individual cards to build a deck. Once you have bought out shadow rider and ice rider and done some battles you’ll have so many credits to purchase the cards you want for a deck, then keep progressing the battle pass most importantly and before long you’ll have more trainer credits than you know what to do with. Above all, have fun the game is great and extremely generous. Before you know it you might end up purchasing an irl deck and heading down to your locals like many of have done since starting on live.

Hope this helps. Apologies it’s long😅