Read: Gene’s Book Periodical Cicadas: the Plague and the Puzzle is available through his website. I own it, and can confirm that it’s the best 17 year cicada book your money can buy. It has all the information you need, and it will make a handsome addition to your home library.
Report an emergence: the Magicicada.org reporting form is live.
The cicadas making the latest appearance are Brood XIV. Brood XIV is centered on the eastern two-thirds of Kentucky, although they are also in 11 other state