Learning a language is divided into listening, speaking, reading and writting.
The tone of pronounciation is hard for you, but generally if pronounciation is right, it would not influence the communication.
As for listening, large number of exercises are required not only for meaning of essence of Chinese character or sentence, but also trying to analyse it from the whole context. I suggest you to understand more Chinese sentences and different topics, such as What time is it.
Hope you can find the reasonable way suiting to you to learn Chinese.