Dick,
The best thing would be to have an observatory in a dark site, the next
best is to have one at home unless the light pollution is really bad.
For security at my place it's on the house alarm system, looks like a
garden shed and has the door frame braced so it can't be forced.
On page 116 of "The Backyard Astronomer's Guide" by Dickinson and Dyer
there's a rating system for your site and a chart on the next page for
judging your limiting magnitude. I observed for about six months in the
backyard before deciding to build and by that time knew the best
location as well.
There's a website of my setup and some conceptual plans.
http://victoria.tc.ca/~rasc/art9703.html Good Luck.

Regards,
Eric

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