As far as Job openings I do not know, but here is the basic rundown of TN wrestling.
Chattanooga is the hotbed of TN wrestling. In AAA a Chattanooga team has been in the state traditional finals for something like the last 25 years. Being in close proximity to UTC and it being the only division 1 wrestling program in the south benefits them greatly. The best schools in that area are Cleveland and Bradley Central (AAA) and Baylor and McCallie (Div2)
MidTN is on the way up. There are schools that are regularly in the mix for titles but just unable to overcome the hump that is Chattanooga. The best schools in that area are Wilson Central, Beech, Blackman and Oakland (AAA but just to the East of Nashville), Centennial, Independence and Summit (AAA MidTN) and Clarksville and Rossview (AAA but just to the northwest). Father Ryan and Montgomery Bell Academy (Div2) are run by the Simpson family and are the two top private schools in MidTN.
East Tn, historically, has a couple teams that can challenge the top teams and are in the mix but don't generally challenge for the state titles. The top teams here are Science Hill, Dobyns Bennett and Knoxville Halls (AAA). No private schools to speak of here. Honorable mention goes to Pigeon Forge. Traditionally the "small school" (A-AA) powerhouse. Every year it seems there is an argument for them to do well in the "large school" (AAA) tournament, although we'll never actually find out.
West TN, there are just a few teams that make noise most years. Arlington being the top AAA team. Christian Brothers is by far the best team out in the Memphis area. They travel well each year and are always in the mix for a state championship.
Hamm does the state wide rankings. He takes a lot of crap each year but he's ok I guess. Here is a link to his website where he publishes them.
http://www.pin-tn.com/