Glad to talk with you about your questions. QQ is a communication tool widely used in China like MSN being fashion in your own country. If you want to use QQ to communicate with your friends，the first step you have to do is to apply for a QQ number which we can use to add friend instead of using email. Perhaps，how to apply for a QQ number means critical to you，you could search on the google or Baidu with the words ‘applying a qq number or 申请qq 号码. either way is available. How to install a qq ？just search on the google with the words ’install a qq‘. the first one is what you look for.

it's a IM. Very popular in China, just like MSN. http://im.qq.com/qq/2012/

you can search a QQ software on the internet and download it

I use QQ as a music software. It's Chinese and is similar to Spotify. But it also has a messenger on it and you can download some music from it.

http://im.qq.com/qq/2013/ mine is 2370871074...xD