Butterflies need specific flowers--ideally from plants native to the area. I did some research, and then lucked out with this little scatter garden kit, containing the plants I wanted (milkweed was my #1)--and more. It also has some nice instructions for this gardening newb.
I love me some butterflies!
Now all I need is a hoe (but who doesn't, am I right? Just kidding...inappropriate...).