any help with any of these questions would be appreciated!

-How do i assign a ringtone to the text message alert?
-and how do i assign one to the email alert?
-is there a way to change the little icons on the bottom of the home screen?
-can you change the lightness or darkness when taking a pic or video?

also, can it be set to vibrate alert on everything..calls and alerts. for when im someplace i can't have ringer on?
AND...how do i set a different ringtone for different callers?
umm, also, is there some place to keep notes?