Thank you guys for the advice. It's been... sort of hard to figure out, but I think slowly I might be getting a better idea.

Main format I have available is standard/whatever-you'd-call-Arena's-all-the-cards-mode-after-they-start-rotating-sets.
I think the two main types of decks I've wanted to try are "something with goblins"(so... red and/or green, I think?) and "big green critters". I also have a fascination with alternate win conditions, buuut it seems like those are hard-ish to achieve with the current standard cards(except maybe mill. But I haven't had much luck in getting that to actually work, even despite the amount of Standard cards for it. I suspect learning some other deck types first would be good)

I also managed to get a lot of "wolf" cards in a recent draft(the 2020 core set, I think?). But I'm not sure how viable that is as something to build a deck around.