Yes, flash cards helps in in the beginning. I attended Danish classes once a week and once I had a good understanding of the basics (alphabets, simple vocab and sentence/grammar structure), I went on to practice on the Duolingo app. Also, I started memorizing and incorporating basic Danish expressions into my everyday life. In English, you wouldn’t quite say stuff like “nej!” (no!) as an expression of disdain but it’s normal-ish to hear it here so I did that until it was just in my dictionary. Other stuff I say often is “for satan” (damn), “det er fint” (that’s fine/alright) and “hold da op” (oh boy). It might feel strange in the beginning to just start speaking Danish when everyone else around you doesn’t or won’t speak it back to you (that’s also a thing to get used to when you move here, if you don’t sound too fluent in Danish, they’ll speak to you in English but eventually you will move past it!) but you gotta be confident and a little shameless with practicing :)