how do I find the lowet declination for my area (virginia beach, VA)?

Answer 1

The most southern declination you can see from north of the equator is 90 - your latitude. Examples:
North pole, latitude 90, 90-90=0
Equator, latitude 0, 0-90=-90
Austin, Texas latitude 30, 30-90=-60

Answer 2

magnetic declination at any point on the Earth is the angle between the local magnetic field -- the direction the north end of a compass points -- and true north. The declination is positive when the magnetic north is east of true north.

VA Beach looks like 12 degress east

Answer 3

http://www.davidchandler.com/docs/PlanetLocator.htm