I'll learn chinese when I have time

I am not working about languages
Else when I am talking of chinese i am talking only about madarin chinese!!! but about every single spoken chinese.
Which implies the huge difference of prononciation between people despite they belong to the same writing system.
Actually I gess I knew what was xingsheng zi but I don't use to name it like that. Is it the pronounciation signs that stand by the characters to give the pronounciation?