I consider myself completely casual and I still try to win most of the time.
That's the good thing about these sorts of games. You don't need to play the meta to get quite high up. And if you ever feel like just getting high up, you'll have the good cards at some point (since good cards still go into fun decks), you can just change it up.
The early journey is just about getting the cards though.
Have you played trading card type games before
@Crazy Jamie? The same concepts of how to win that apply in all of them apply here too.
Also, VERY important that I've just remembered. You will play bots. When you lose some amount in a row or a game takes too long to find, they'll put you up against a bot. You can definitely win mostly against bots and also get paid out cubes for it. Maybe there's a guide out there for it but I think you'll have no issue working it out so long as you're aware of it.