How can I change the ringing noise when I place a call?
Your question is a touch confusing, especially due to the use of the word 'ringtone', but I think this is the crux of what you are asking: 


  I just want to change the sound when I place a call and it rings while waiting for the other party to pickup.


The answer is no.  That sound is generated by the communications network, and your phone is just playing it to you.  Your phone has no native way to differentiate between that sound and the sound of the person on the other end (or their voicemail).

In theory, an application could be written that would listen to all the sound during a call and adjust volumes depending on what it hears.  I performed a fairly exhaustive search, and found no applications that currently do this.