Lots of fairly easy options, depends on your situation and what you want. Cheap easy "barrel" is a 20 gallon galvanized garbage can from the hardware store. Hang it with a programable timer/motor unit screwed to the bottom of it and you're done. Holds about 100 lbs of whole corn.
More elaborate set up would be be a 30 or 55 gallon steel barrel with programable timer screwed to the bottom of it. 30 gallon barrel holds 200 lbs of whole corn, 55 gal barrel holds 300+ lbs of corn. These large/hevy barrels require a sturdy support system such as steel legs or hung from a tall tripod frame or large tree limb with a boat winch and steel cable. Bolt on leg kits, motor/timer assemblies, and other accessories can be ordered online.
Coons are a problem to feeders. They can/will climb any leg and get to the corn. They will eat and spill a considerable amount of corn every night. I have seen as many as twelve coons at one feeder. They come and go all night. They can bite and chew on the motor, spinner plate, wiring, etc. Eliminating the coons is the only surefire way to protect the feeder. A dozen DP coon traps set around the feeder and along the coon trails leading to the feeder will get most of the coons in a couple of nights. Hanging the feeder on a cable and winch from a high limb is the most varmint resistant mode.
Running the timer/motor for 4 or 5 seconds will throw about 1 lb of corn. Do that morning and evening will throw approx 2 lbs each day. Double or triple that if coons are raiding the feeder. Most hunters run them 6 - 8 seconds twice a day to get more corn on the ground.
Good luck.
Dave