[ddots-l] About mixing

Hi guys, 
I need real help or advice about mixing. 
I usually assign all audio tracks to one master in the Bus pane. Do you think 
it is good to have different buses for different audio tracks. For e.g, one 
master bus for Drums, another bus for Vocal, another bus for bass, another bus 
for the rest audio tracks. Or is it good to have one master for all the audio 
tracks? 
Finally, who can suggest me where I can get this tutorial about mixsing? 
Thank you in advance, 
Berhane

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