Welcome Stacy. Please take the following with grain os salt as this is my second (I round up) year with bees. Most of what I think comes from 1) books, 2) Michael Bush web pages, 3) this forum 4) YouTube.
1). A site relatively close to water ( water that will not bring conflict with people, ie a pool). 2). A sunny spot with good morning light, more dappled light in afternoon, ESP in warm area 3) an area with good mix of nectar sources in two mile radius, 4) place easy to get to to work and inspect, 5) place safe from vandals and or problem animal pests, 6) legal considerations from local laws.
That is the balancing list I came up with when I was looking for a spot.
Good luck with your girls.