But it seems most people want to start with learning typical adult words/phrases and building the rest of their language around that.
I am guilty of this.
When I first came to Poland I started learning by swapping Polish for English lessons with a friend.
I learned everyday Polish words and phrases, with no focus on grammar.
I got polish baby's books, bright colourful ones, to learn from.
Children's books are too compicated, each word is made up of 142300048992 letters on average :)
I learned poems (Limericks) in Polish and jokes.
I remember there was a book that had 3000 words in English and Polish that were very similar.
The grammar I do by sound now. I am very very bad at spelling and grammar (even in polish) :)
I must improve my Polish more.
I speak three other languages to varying degrees.
I did not have a "school were the best years of your life" time, far from it, I rather learned these languages from living in the countries.
I would like to go to a direct method of learning polish but I have never heard of one.