Hi. One month is not so much. I think you have to concentrate on German pronunciation first. Work really hard to get it right.. I say this to you because you are Chinese and I heard some Chinese students who studied German at school speaking and I could not understand a word. Actually it is the same for us Europeans who study mandarin. Without proper introduction on pronunciation of the pinyin it is no use to continue studying. It is essential. Learn from a linguist who knows what he is talking about not necessarily a native German speaker. After that study common phrases and learn them really well so you can use them correctly. Then you can use a good spaced memorization system like Anki or Memrize(www.memrize.com). they have German courses you can study for free. So has ITunes University. Try to use the language as much as possible. Everything you learned remains kind of abstract before you have used it in real communication. That is how II feel with my Chinese.

Hello, To learn a language, it is necessary to focus on all the above mentioned aspects. You can practice grammar points by reading a text or listening to something.