You might also want to look into the Reference Scale options. Right-click the map, itself, at the top of your Contents pane, and click 'Properties'.
I forget the exact location off the top of my head, but I believe it might be under "Extent Options" in the General setttings.
Zoom your map to what looks reasonable to you, note what that zoom level is, and put that zoom level in the reference scale box mentioned above. Then, no matter how much you zoom in or out, all of your symbols will stay the same size, relative to that zoom.
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M Reed
"The pessimist may be right oftener than the optimist, but the optimist has more fun, and neither can stop the march of events anyhow." — Lazarus Long, in Time Enough for Love, by Robert A. Heinlein
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