@user65480,

Start by listening to these lessons in any order. Goal should be to maximize Chinese language input, while dealing with usable chunks:

http://popupchinese.com/lessons/absolute-beginners/

For individual phonetics of specific characters, there are audio recordings here, navigable by the pinyin chart:

http://popupchinese.com/dictionary

Don't worry too much about the study center until you know the most common words and phrases and are more comfortable with the sounds of the language.

Best,

--david