I read simple books to learn. The vocabulary is simple and there will be new words. I'm reading Alice in Wonderland in German. As for listening, I recommend listening to clealry spoken songs and watching movies. It is usually easy to find song lyrics online.

as for accumulating vocabulary,there is only one advise I can give you.recite it fast in a very short period.you have to pursue the amount instead of the quality.And may be after a month you can start reading some material.Then you will have a feeling whenever you confront some words you have already recited.it really means a lot to you.I am fully convinced accumulate vocabulary slowly and continually is a good idea because everyone have to experience a very fast-learning period,you have to make a lot progress