well, I’m the person who believes that all the sections, Speaking, Listening, Reading and Writing, are correlated.
so I recommend you to use many methods to study Korean language.
It could be a bit difficult to suggest you specific ways to study it as I don’t know why you are studying it.
but, you should get a textbook or online sources which are well organised then you can just follow the order step by step.
and after learning new expressions, now you are ready to use them by writing and speaking.
I hope it is helpful to you :)