(East-Central Ohio). I put up ~ 12 next boxes around our farm in late-February. One - on a barn near the house - was occupied (others maybe, I don't go out back every day).
I observed the family most days. I've seen 6 at one time multiple times so I assume 4 chicks hatched and made it. I'd observe them, make some notes, go in and read about them. I'm amazed at the lack good info about them, in two specific areas
1. Box plans were easy to find. Solid info on placement was not. Only after I installed boxes just inside the treeline off the edge of a field did I read "kestrels will not usually nest where there is a tree canopy". So, OK, I'll move some this Winter.
An important aspect of this is territory size: how far apart should boxes be; are kestrels cool living near other families (as barn owls are); what other kinds of birds will drive them from a territory; what birds co-habit (I left a wren box directly below the kestrel box and both families were active through the summer)...?
2. Once I started observing them, I expected to find good detail about their behavior: hunting; training fledglings - how, how long, near the nest/not, ...; food preferences, ....
All of this info is available but it takes hours and hours of reading. Why? It's 2015, we've been studying raptors for 100+ years, we want to encourage breeding (kestrel population is declining ~ 1%/year per Cornell).
This sounds like complaining but really it's more amazement that there are not better resources. It's seems easy: "Want to encourage kestrels? Here's everything you need to know in one small e-brochure". If that exists, I haven't found it.
The same was true of barn owls. Ohio claims to have an aggressive program to restore them. Is the info you need collected in one place? No.