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How should I setup or design STP (spanning tree protocol) on our layer 2 network?

How should I setup or design STP (spanning tree protocol) on our layer 2 network?

Do I enable STP only on our core switch?  Every switch?  Only distribution switches?  What is the appropriate design.......currently, one wrong move or patch, we will have a routing loop broadcast storm.

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Interserv

Spanning tree is rather nice, because it is easy to set up.  You practically turn it on and walk away while it removes loops.

You would want spanning tree enabled on all switches.  STP will choose a root based on the lowest bridge ID.  The root switch is the master for spanning tree.  All of the non-root switches will build the shortest path to the root and remove any redundant routes.   Make sure the root is placed near firewalls or routers that are most used as the root will be the most used switch.  

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I guess that should have been the real question......Should our core switch be the root switch?
Also.....what if STP was only setup on a couple of switches?  Would we still get broadcast storms?
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src1963
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The core switch should be the root and you would want to give that switch higher priority so others STP will choose it as the root.  Depending on where the switches are physically located you might not get broadcast storms.  Is there a reason why you wouldn't want to have STP on all of the switches?