Lot of opportunities/options at HEZ for radio communication, despite being non-towered.
Unless you need to get an enroute weather update or re-file with FSS from the plane, just talk to Houston ARTCC on 120.97 (air or ground) to close/open an IFR flight plan (you'll be talking to them when you start your descent for the approach, anyway, if you are IFR inbound). If you call them on the ground for a departure clearance, expect a void time. If it's VMC, you can activate it in the air, unless your instructor wants the void time drill.
Talk to Greenwood FSS on 122.1 or 122.2 (air or ground) if you need to for the practice using the VOR split frequency, otherwise, I'd call them on the phone in the terminal if I needed an extended conversation. There is a DTN terminal in the pilot's lounge, too.
Give/get local traffic advisories on Unicom 122.8.
FWIW, the ILS for 13 at HEZ requires an ADF or DME as noted on the approach plate.
http://www.airnav.com/airport/KHEZ
Some recommendations on radio phraseology/techniques...
http://www.faasafety.gov/ALC/libview_normal.aspx?id=550
Have a great flight. Unfortunately, the lady that use to cook burgers in the terminal for lunch retired last year...after nearly 25 years.