A friend posted this to some Northern VA list serves. I checked out the info. Very informative. There's even a video on how to find Monarch eggs in the wild.
"With the increasing interest in raising caterpillars, here is a link to the fairly new Raising Butterflies website, which provides some very detailed and useful information and techniques for rearing butterflies. While the focus is on western U.S. butterflies, many of the species and techniques are applicable to the east.