I fell down a shoot but couldn't get out! It is a good thing I saved just before the fall. Can someone give me directions on how to find this serpent master?

I can tell you're frustrated, so
SPOILER COMING
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Map the area seperately, draw your 4 large crosses representing the rooms. Work our way through them slowly, marking in which elevators are linked by the underground passages. Put a big S for static on the elevators that don't move. Link all your elevators and work your way back to the area with the lever, the lock, and only 1 moving elevator. Switch the lever, and you will notice that one of the three elevators that you had marked as static will start to move (from memory it is in the original room you entered, but don't quote me on that). Go down that elevator, and throw yourself down a rock schute (that you can't climb back up). Walking around the corner you will come across the serpent caretaker that has the serpent key you need to access both of the locked doors in this area. There is another lever here to activate the remaining elevators (that both end in his room). Happy hunting with the priestess.

Um yeh, whoops that should be the skull key shouldn't it - trust me anyway, it will be the key you that you crave.